It says right there that it can be done with the software so shouldn't need anything extra. I'm a lil confused as to why drive keys need to be extracted. The wode jukebox for the wii doesn't need keys. The 3k3y for the ps3 doesn't need keys neither. Keys are normally used for flashing like with the 360. If I understand correctly ode's plug between your drive and board bypassing the drive(emulating it) trick it into loading from USB,SD,ext hard drive to. I personally have the wode couple wires, then load the firmware after that good to go. I could be wrong I'm not the greatest at tech talk lol.
It would appear from the way the ODE groups are talking we will need keys for WiiU. In theory they should be attainable via a software exploit but unless Nintendo are idiots that key the process to attain that key would need a kernel exploit which are so far only rumored.
The keys might be pulled via a firmware dump of the drive (like x360). The ode itself might be able to pull the firmware or keys.
Hopefully all will be known soon enough. I just know the second I update past 5.1 the news will break you need 5.1 to dump your keys....lol. I can't afford a second WiiU so I am just biding my time playing my bqcklog and messing with Nintendon't.