sadly... I dont think it will be DLC *i mean thats a lot of data to download at some point...* but its kinda a tradition to remake the same game, with a few differences, and sell for as much =\
SF II = basic game
SF II Dash = 4 bosses playable
SF II Dash Turbo = new colors/rebalances/stages/etc
SF II the new challengers = 4 new characters, and the usual stuff
SF II Turbo = akuma added, hyper combos
SF II Hd Turbo = Better graphics
then you have other bigger titles...
*i would do guilty gear 1/X too but... I recall XX being less interesting =P*
Guilty Gear XX = basic game
Guilty Gear XX #reloaded = rebalanced
Guilty Gear XX Slash = 2 characters added/rebalanced
Guilty Gear XX /\ Core = 2 characters removed
Guilty Gear XX /\ Core Plus = 2 characters added/more useless updates...
now we have SF IV, and Blazblue getting new games which are basically nothing... so i expect to see it for the full retail price =\