UPDATE ONE: The Division is back online and while Ubisoft have confirmed that they have no changes or patch notes to provide on today's downtime, they have supplied the official Incursions Update details.
The full patch notes can be found below and include a huge list of features heading to the game on April 12.
The Division update 1.1 will deploy on that date, and Ubisoft have supplied new details on what players must have achieved to play the new Falcon Lost mission.
The Division Incursions Update:
Falcon Lost

  • Falcon Lost is a new incursion available in the Stuyvesant area
  • You must be level 30 and have completed the mission "General Assembly" to access this mission
  • The encounter is balanced for 4 players with high level gear

Gear Sets

  • Gear set equipment can be found by completing the most challenging activities in Manhattan
  • Collecting and wearing gear sets grant powerful stat bonuses and talents
  • Gear sets of varying gear scores can be found for many playstyles. Find the set that best suits yours
  • “Tactician's Authority” – enhances electronics and support capabilities
  • “Striker's Battlegear” – provide bonuses for assault capabilities
  • “Sentry's Call” – enhances marksman capabilities
  • “Path of the Nomad” – provides bonuses for lone wanderers

UBISOFT
The Division will be down for around three hoursTrading

  • Items dropped by enemies can be shared with other players
  • Trade items by dropping them as loot from your inventory, so players in your group can pick them up
  • You can only share items for during the first 2 hours after you have acquired them
  • Items can only be shared with players who are currently in your group and who were also in your group when the item was originally dropped

Assignments

  • Assignments are automatically obtained when you log in and can be tracked from the map via the menu called “Mission Overview”
  • Assignments are available for a limited time (24h for Daily Assignments and 7 days for Weekly Assignments), after which, they will be replaced by different assignments

Assignments come in different categories:

  • Combat
  • Dark Zone
  • Crafting
  • Most assignments can be completed while playing alone but some will require enlisting other agent’s assistance to complete

Dark Zone Supply Drops

  • Dark Zone Supply Drops are a global event where the Strategic Homeland Defense agency airdrops multiple supply caches to assist Division agents
  • Supply drops will occur multiple times over the course the day
  • The supply drops will contain non-contaminated gear of all types that will be ready to use without the need for extraction
  • These supply drops will be heavily sought after by other agents and enemy factions that roam the Dark Zone, so be ready for resistance

Gear Score

  • Every non-vanity gear piece that can be found when your agent is level 30 has a Gear Score value. The higher an item’s Gear Score, the stronger the item
  • The overall Gear Score of your agent can be seen in your main menu next to your player level. Gear Score indicates the advancement of an agent
  • Other agents’ Gear Scores are displayed next to their health bars
  • Improving your gear and increasing your overall Gear Score will grant your agent access to the most dangerous high-end challenges

Group Spectator Camera

  • The Group Spectator Cam lets players spectate members of their group while waiting to be revived or the entire group to be down
  • Players can use RB/LB, R1/L1 or Q/E keys to switch between group members
  • New High-End Named Weapons
  • Added new High-End named weapons:
  • Warlord: Assault Rifle
  • Valkyria: Submachine gun
  • (Historian: Marksman Rifle) Please note that while the Historian will be implemented in the game with this update, it will not be acquirable in-game until update 1.2

The full list of game changes for The Division can be found here, above is the list of new features coming to Xbox One, PS4 and PC.
Watch live video from TheDivisionGame on www.twitch.tv
The development team recently confirmed that they planned to take the MMO servers down around the same time each week.
The April 5th scheduled maintenance period will last around three hours and will start at 8am, UK time.
Ubisoft have yet to confirm if there will be patch notes or a changelog to notify fans what has changed.
"The servers will shut down for maintenance on Tuesday, April 5 at 09:00 AM CEST, 03:00 AM EDT, 12:00 AM PDT. Estimated downtime is approximately 3 hours," Ubisoft confirmed in a recent online post.
"Please follow this thread for any updates as the maintenance progresses."

The game was recently taken offline to remove a new exploit found to help with farming loot.
Players discovered that if an NPC named Hutch, who is fought on top of Madison Field Hospital, is killed without him jumping down from his starting ledge - then the battle can be repeated to gain extra loot.
The Division team have been busy removing exploits where they find them and have recently made changes to how NPCs spawn to put a stop to some of the loot cave item farming techniques.
Ubisoft usually hold a Special Report event on Twitch during the maintenance, which can be watched above when the downtime starts.
The Division is also set to get its first free update, Incursions, later this month, it is unclear if this maintenance period is in anyway connected.
The Falcon Lost Incursion arriving April 12, is set in a completely new, underground water-treatment facility that’s been turned into a stronghold for the Last Man Battalion
Four rare gear sets will be part of the Incursions expnasion: Sentry’s Call, Striker’s Battle Gear, Path of the Nomad, and Technician’s Authority.
Finding and equipping four pieces from a single set unlocks a new talent for your Agent, which the developers aren’t revealing yet.
You can replay Falcon Lost and other upcoming Incursions as many times as you want and still be rewarded with new loot.