IGN has a Return to Castle Wolfenstein preview with single and new multi-player maps.
"As with the old Wolfenstein, there will be plenty of puzzles for you to figure out as well as Nazis to gun down. And there are still plenty of those secret places for you to find hidden around each level. They showed a little teaser where there is an armory that you can actually see but not get to. If you want the ammo then you'll have to find a way to break-in in another location of the map.
All in all, the game looks to be in pretty good shape. The graphics are crisp, the frame rate is good, and new features abound. The Wolfenstein line of games seems to be in good hands with Gray Matter, but you'll have to wait for a while for it to reach stores as they still have a bit of work to do. They didn't give an estimate on time of arrival for now, but don't worry...we'll keep you updated."
News source: IGN