Only a few of the ODE's I've came across have been able to "automatically" extract the keys. Of course the Wii U is a different system so it might have a different way of obtaining keys. On the Xbox 360 the keys are by motherboard basis. Meaning that only disc drives that had the key the motherboard had will work on it. Same for some models of the PS3 where the disc drives came with a daughterboard. The motherboard would only recognize blu ray drives that had the correct daughterboard. (If you had a CFW PS3 you could remarry a drive with a different daughterboard but that's getting off topic.) Going on however most 360 ODEs only have automatic key extraction for the Slim Liteon 16D4S, with every other drive requiring you to dump the keys manually. (Whether it be external drive tools or for Slims RGHing/R-JTAGing the console just to get the keys.) The PS3 ODEs on the other hand are pretty much "plug n' play" in terms of opening up the system, connecting the wires/cables, and closing back up the system. (Newer PS3s however do require some soldering to get the ODE to work.) They don't require key extraction but they do require specific PS3 games in the disc drive. (Full list of usable games on their websites. Perhaps they had some kind of weakness that allowed the ODE to spoof the games.)
Looking into the Wii U I see that people sell replacement drives which leads me to ask if the keys are actually on the Wii U disc drive. If they're easily replaceable without swapping out some PCB then I'd be inclined to believe that they're waiting for some sort of exploit to allow them to get the drive keys. (They probably have some way to get them now that isn't so user friendly.) Though we haven't even seen a proof of concept with the Wii U running any games with any device attached to it leading me to believe that the Wiikey U is either non existent or delayed until a user friendly exploit is out. (Been reading on the webkit exploit, wonder if they're doing something with that.)
So yeah. Holding off on a preorder until I see some definitive proof this thing exists or at least know a bit more how it functions.
EDIT: Just woke up so I don't know how clear the above writing is. Do forgive me.