SC is as good of a series as Tekken albeit not as popular. I think it's reached the stage where only minor changes in movelists + new stages etc. is required. Tekken isn't showing much innovation other than in the physics engine and stage design and SC could easily work toward making minor, baby-step changes. After all, too much change can be a bad thing.

As long as Cassandra remains the powerhouse she was in SC3 as well as SC2, I will be more than content. A definite return to the arcades will really have me off my feet though. Online play would be awesome too, but nothing beats a good ol' fashioned coin-operated pwning.