The 'Wii U' name is here to stay.
When the Wii U was announced during last years E3, there were a few people suggesting that the name would change after the publics reaction to it. Nintendo has recently created an official Wii U Facebook page which shows a very slightly different Wii U logo. The logo looks almost identical, but the important part is that the name hasn't changed, and with only a couple weeks until E3, its very unlikely.
Facebook: Official Wii U Page