I calculated before that if Nintendo is following the same trend with Wii U, then some devs would get the final kit in January at the soonest (assuming a July launch).
If we take on consideration that Wii graphical power was equivalent to 2 gamecubes duct taped together and WiiU is in its 5th devkit iteration the only reasonable conclusion is that WiiU is equivalent to 5 gamecubes taped together.
What I mean is those iterations could be related to controller comunication improvements (two controller support, more stability, etc), not graphical output power necessarily.
If we take on consideration that Wii graphical power was equivalent to 2 gamecubes duct taped together and WiiU is in its 5th devkit iteration the only reasonable conclusion is that WiiU is equivalent to 5 gamecubes taped together.
Now that is interesting, since Ilherre said before that the RAM quantity has not changed since E3 and that it had a minimum of 1GB... (1.5GB minimum now?)