Confirmed by Joey Cuellar, Sega is going to EVO and will have Virtua Fighter 5 Final Showdown not only available for demo play but also for a tournament where the best players can win money totaling in $15,000.
As Cuellar suggested, go get a copy of Virtua Fighter 5 at your local game store and practice! Yes the console versions are different from Final Showdown including move changes and stat modifications but the game is universally similar.
For the best experience, I suggest picking up Virtua Fighter 5 Online (aka Ver. C) on Xbox 360 especially with the addition of online play. It's pretty cheap used and there is also a downloadable version through Xbox Live! The PlayStation 3 version only has Ver. B and no online support.
Tournament registration will handled by Sega. Details whether if it will be online or on-site haven't been revealed. You will need all the practice you can get as everyone around the world are converging in on EVO including Japan. Let's do this!