Christian Svensson has confirmed another reason you might want to check out Resident Evil: Revelations HD when it comes to the Wii U, even if you own the original version of the game on the 3DS. He’s said that:
The other thing you should look forward to is trying out the extremely expanded raid mode (details to come in the coming months) in RE:Revelations. I find it scratches a LOT of the same itches.
I’m curious to see what his definition of “extremely” turns out to be.