Not much info but as far as i can understand the game has been adapted to a 16:9 screen ratio, sprites have been updated as well as having new 3D backgrounds.
Check out the site below for about 7 pages of screenshots.
As far as i'm aware this game will be released on Xbox Live Arcade sometime in 2010, along with Metal Slug XX, King of Fighters Skystage, and King of Fighters '02 Unlimited Match.
Also a new 30cm Vanessa PVC figure will be released next year, it says on this promo image that it will be released in March, though the preorders on Playasia have it set for April.
Check out the preorder here.
One last thing, the KOF Skystage blog has been updated with new screens including screens of Rugal and check out the mini game they have on the site.
You can either view it here or directly to the game here.
Edit: I found from the main site how to add it to my blog, so the game is now on the side bar here too :D