On the topic of third party publishers supporting the Wii U ...
Personally, I expect publishers to take their risk minimization strategy to the next level in the next generation, and games will be developed to target an unprecedented number of platforms representing an unparalleled variety in capabilities. In concrete terms, for the first several years of the next generation I would expect most games to support the PC, current generation HD consoles, all released next generation consoles, and possibly even some smart-phones, tablets and hand-held systems.
Only when the install base of a platform became so small, or the customization costs were so high, that expected game sales could not recover the platform specific development costs would I expect a platform to be ignored; and for most games I would think that expected game sales on the Wii U version would have to be lower than 200,000 to 250,000 to justify ignoring it as a platform.