"An unnamed source at Wii U Daily has told the publication that Wii U will retail for $299.99 when it arrives in North America"
Wii U Daily is a fan site for Wii U news, therefor this is unreliable. But that being said, $300 US does sound about right. Australia (getting horrible prices for things as usual) will probably get it for $400 - $500.
Nothing is official untill Nintendo announces the price which will happen at E3 by my guess. Even that is making an assumption which is a pointless practice that I despise doing. I'm gonna do it anyway though. They will announce the official price at E3. Any article up untill then (or whenever they announce it) relating to the Wii U price point should be considered unreliable.
I'll be passing up the Wii U as i will probably get a PS3 when they go on sale or if I were to buy a new system I would wait till all the new systems are out and go from there.