The problem with what you're saying is that it isn't 2005 tech "remade today". Most of the tech has never been available anywhere before, based on the highly customized nature of it. Even if you consider what the tech was based on, HD6XXX wasn't available until December 2010 (the E6760 wasn't available until 2012) and the Power7 wasn't available until 2010. DDR3 wasn't available until late 2007.
Not much has changed since then either, the basis for those technologies are still being used for the likes of HD7XXX and HD8XXX, the only difference being more of the same.
At the end of the day, you can get technical. But I don't consider the Wii U technologically a next-generation system. When you look at what is being offered on other platforms it's clearly superior. In my eyes, there is no difference. Yes, it maybe customized to fit Wii U with modern day technology. But it's not necessarily pushing any boundaries.