The following information comes from O1net, the same outlet that posted yesterday's 3DS rumors...

- Wii U chipset may be limiting hardware performance and “a tad too cheap”
- wireless functionality not up and running yet
- 4th prototype coming by the month's end

“So far, the Wii U controller’s main chipset – that manages the device’s essential functions, including streaming and wireless – seems inadequate. This chip, described by our source as maybe a tad too cheap, has been the sources of many headaches in recent weeks. So far, the wireless functions simply do not work – at all. There have been so far three different prototypes, and a fourth iteration is expected by select developers at the end of the month.”

- controller “is fitted with a small black box”
- dev kits aren't working properly

“So far, developers are working with a tethered controller: each one is fitted with a small black box with a tethered connection to the main unit. And even then, it still doesn’t work properly. Many developers are feeling lost, their progress impeded by a distinct lack of visibility, their working days paced by the quasi-daily software updates. In those conditions, many feel unable to properly exploit the system’s most innovative and promising features, those very features they haven’t been able to test properly so far.”

- “developers are still expecting a June 2012 release”
- could be delayed to September

“Ten months before the tentative release date – developers are still expecting a June 2012 release – the fact that Nintendo engineers are still struggling to make this supposedly final architecture function properly is worrisome at best. Could Nintendo have to make radical last-minute changes, and if so, what would be the cost? This unexpected development runs contrary to Nintendo’s reputation for carefully weighing all tech options long before any announcement. Inside the company, there have been talks of a delayed release, with September as a new tentative date. Being three months off-schedule doesn’t seem such a big issue, when compared to a home console’s life cycle. But this is not 2006 anymore. The industry is undergoing a radical mutation, and there is a growing amount of rumors positioning Microsoft’s next system to be unveiled during the 2012 E3 conference, and a relase in short order. If that was to happen, the Wii U would only enjoy a few months of ‘optimal run’ alongside the Xbox 360, which would essentially moot the much-touted ease with which developers can port 360 code for the Wii U. To succeed in its incredibly audacious endeavour, Nintendo will have to walk a very tight rope.”