I even would say that I would like to have some DLC. Sadly, there's no fighting game nowadays that didn't expand/sale accessories by DLC. Costumes, stages, characters, whatever. And let's be honest, it keeps you playing and getting hype for that game. While I prefer costumes, stages and things that don't affect seriously the gameplay and while I think it's unffair to add DLC characters in a fighting game, well... characters increase the hype more than a costume, and probably the sells as well.
But if they do that, I would prefer it as an expansion of the game some months later. Like what Ultra was to SFIV or Ultimate to DOA5.
But my concerns right now are:
-Gameplay. I think the game still needs to prove how serious, well balanced and competitive is.
-Online. Without a good playable online and won't care a shit about DLC or what come later. Without good online I'll play offline modes for first weeks and then the game will be abandoned.