Well I have heard a rumour from someone who's brother works for a big game developer and he told me the the price in the UK will be £250-299....Of course I can't say this is definite...but his brother has worked for this company for many years on Xbox,360 and PS2,PS3 software and they working on Wii-U now too.
The Wii-U looks great and is...but its not really next gen.A lot of it is of the shelf parts that have been around a while.
The days of massive profits are over (for now) and adaptability is the name of the game.
My friend did stress this is a rumour within the company but I think this sounds about right.
It wouldn't overly surprise me if PS4 is heavily based on off the shelf parts with their direction with PS Vita, but I highly doubt this will be the case with Nintendo's Wii U. Its highly unlikely that the final chips will be off the shelf parts especially with Nintendo's history. Early dev kits often are made using off the shelf parts, but early dev kits don't usually represent final components. First, second, and maybe even third generation dev kits for Wii U no doubt use off the shelf parts, but the final components will be heavily customized.