Do remember the rumored size of the comet (Destiny)

by MacAddictXIV , Seattle WA, Wednesday, May 06, 2015, 14:26 (3488 days ago) @ CruelLEGACEY

If the comet is as big as has been suggested, I doubt it will be completely Hive. I would imagine we're going to get a roughly equal amount of new content (as far as missions/strikes) for each race, but maybe the Raid is a Hive Raid. I can't imagine that 12 missions and 4 strikes (the numbers according to the leaked slide) would all be Hive themed.

You're totally right in terms of who we'll be fighting across these missions... but with the lone new location seemingly Hive themed, I think it's safe to say we'll see a lot of it. I'm sure the other factions will play into the expansion prominently enough, just in previously existing locations.

What I want to see is more interaction between the races. That can either be fighting or cooperation. There isn't much of a stance as to why they aren't fighting each other just as much as they are fighting us.