The newest iteration of the hardware will arrive either this month or next.
Nintendo will be sending out the next generation of Wii U development kits either this month or next. This news comes from comments Sega Europe's Gary Dunn made to Eurogamer.
As was reported earlier this week, the kits that developers have been working on are underclocked, and Nintendo deemed the visuals they produced as not of sufficient quality to show at E3. Dunn explains that the new kits will be more representative of the final components of the Wii U hardware. "It's still a little early. There's another generation of prototype hardware coming out in June or July that's going to give us more information."
Dunn would not comment on how long they've had their current Wii U hardware, nor could he say if the system is more powerful than the PS3 or 360. He noted simply that "it's different" and that the system is "quite powerful." He also noted that Sega's engineers have been able to easily get prototypes running on the new hardware.
Sega's Alien: Colonial Marines has already been announced for Wii U. He confirms that the porting process can be done "very quickly", but also cautions that Sega will make all porting decisions based on "platform by platform consideration." He also points out that they aren't interested in straight ports of PS3 and 360 games as "the new control mechanic allows some asymmetrical gameplay which we're quite excited about - to leverage that when we're looking to put any game on that system."