Only USF4 gave you all costumes and some stages from SFxT. Super gave you the new stages and characters obviously, AE gave you new characters (except Dekappa) but none of the versions gave you any costumes. Maybe whatever they call the final version of SFV will give you everything but that will be awhile.
Never assume Capcom is giving away anything for free lol
Yeah, they don't say anything about the costumes and stages, and seeing as how they want folks to buy all that...I wouldn't count on them being there at all. The stages I could see -maybe- being there, but not the costumes. They want that cash.
Wish I hadn't bought SFV. This version is a good deal. Yeah, the gameplay updates are free, but this has the base game + S1/S2 season pass stuff included for $40. Much, much better deal. I haven't bought any of the season pass stuff so I might wait and see if this drops to $20 and rebuy it just to get the characters for cheaper.
They've put the season passes on sale before, so there's a good chance if anything that the passes will be dropped permanently to $20 each or made even cheaper. But sure, waiting for it to drop to $20 on its own is could be cheaper...
...that is until Season 3 drops with more characters/stages/costumes/money that they want from you, lol.
I wouldn't be surprised if Season 3 starts with more DLC right when AE drops.