I'm missing Biotic powers like Reave and Slam.
just read the IGN writeup about spending 3 hours with the game. the author said that each tree has 12 abilities, which matches what has been shown in the vids so far.
so, maybe powers like Tech Armor, Reave, and Slam have indeed been removed.
that being said, it seems some of the squadmates of have "unique" powers. Like Liam has a "dual omni blade" strike move that I didn't see listed in Ryder's skill trees.
so, maybe more powers can be unlocked via sidequests and loyalty missions?
if I remember, Reave was a power that had to be unlocked in prior games.