Mega man legacy collection 1 and 2, also x collection is launching this summer.
Devil may cry hd collection
Street fighter 30th anniversary collection (launching may with 12 games)
Capcom arcade collection (xbox 360 but backwards compatible)
Fable trilogy (backwards compatible)
all the sega vintage collection games
Zombie army trilogy; Assassin's Creed the Ezio collection, Metro redux; Saint Row IV+Gat out of Hell; Bioshock collection, COD infinite warfware legacy ed, Borderlands Handsome collection. Also in Gears of War 4 there are download codes for the previous games and Just cause 3 has the code for Just Cause 2 (but you have to buy them new; no idea if the codes are present in the online versions)