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Hm.. to speculate or not to..hm..
First, air travel between Edmonton and Montreal is very, very expensive. To bring the Edmonton team to Montreal to view a new ME:A trailer makes no sense. Something is up and big enough for Bio to spend money to bring the whole team in one place.
Speculation(s).
1. The project is in trouble.
There is nothing better for management than bring the team together to explain the severity and negative domino effects down the road with other projects. Kinds of trouble? I lean towards the focus on exploration was found to negatively impact game pacing. It is after all a shooter, especially the MP game. This will delay the game as changes are required and the mgrs want to team to understand and ask them to refocus their efforts.
2. Maintain Secrecy - or ensure your mouth is zipped up tight.
Could be there is some leaks or re-emphasize the need to everyone to keep mum. With everyone in the room and senior managers explaining what is going on and reminding the team that Bio has a contract on their souls (he he). Still, a video conference does the same job and less costly. Frankly, this is a low probability.
3. Staff Changes
Low probability, unless senior staff is affected. The new management wants to talk to the team face to face.
4. Change in game play mechanics.
Could be that after watching recent gamse from the competition (ie: Halo 5) and Star Wars Battlefront Bio realized their original thinking requires a radical course change. This ties with item 1.
5. Bio has money to spend
Management decided to bring the whole team together for a Halloween Shindig and as an appreciation for their loyalty and hard work.