A few new potential details regarding Mass Effect 4 may have just surfaced on NeoGAF via user shinobi602, who is suggesting that Bioware is likely to release the next game in the sci-fi RPG series around Q2, 2016 (while it is stated that no internal date has been set as yet, the report says that "it's 100% coming next year").
Other interesting details mentioned in the post include details of a 200-strong cohort of developers, with the 50 devs said to be working on the game apparently quadrupling following the release of Dragon Age: Inquisition.
It was also suggested that the game is "massive in terms of size/scale" and that "doubling down on one single engine (Frostbite) across all the studios is a huge advantage." Finally, the NeoGAF user also suggests that the title of Mass Effect 4 has already been decided upon, although nothing further is offered in this direction.
Of course none of this is official, so prepare yourselves a hefty pinch of salt to go with these rumours.