I was browsing around on the site of a former working partner (when I was in retail), PAN Vision. It's one of the largest distributors of video games in Scandinavia. Anyway, while their Wii U section was sparse on titles, there are actually some dates marked:
Rise Of The Guardians
Format: WIIU
Supplier: NAMCO BANDAI Partners
Release date: 30.09.2012
Product number: 4932ROG
EAN: 3391891966719
http://www.panvision.com/1/1.0.1.0/33/1/?item=prod_prod-s1/54252&group=prod_prod_grp-s1/1835
The date 30th of September is most likely inaccurate due to the following quote from D3Publisher:
Rise of the Guardians: The Video Game will be available at retail on November 23rd, 2012 to coincide with the theatrical release of the film.
Also, the cover is nothing to get excited about, it's just a poorly done shop. Interesting though is that they have chosen the NA cover which differs very much from the European version. It's not like they couldn't have taken the Wii cover and slapped some PEGI marker on it.
The other title is Sonic, with the announced release date (for PlayStation 3, Xbox 360, Vita and 3DS):
Sonic & All-Stars Racing Transformed
Format: WIIU
Supplier: Sega
Release date: 16.11.2012
Product number: 49861SART
EAN: 5055277019182
http://www.panvision.com/1/1.0.1.0/33/1/?item=prod_prod-s1/54242&group=prod_prod_grp-s1/1835
All this may seem trivial, but having worked with this company I can say they are adamant on details and rarely put up unverified release dates in this format (if they don't know, it's often written something like 32.12.2039). Also, they leaked release dates for both StarCraft II and Star Wars: The Old Republic way before Blizzard respectively EA did. And those dates were spot on. If it says much about this I don't know, but they haven't got a bad track record anyway.
I also tried searching the EAN numbers (GTIN is the correct name) via
GS1, but the servers did not want to cooperate. Perhaps someone else can try, choose "Search by barcode (GTIN)". I've never seen PAN Vision use faulty bar codes anyway.
On another note with the acquisition price that PAN Vision has on Sonic & All-Stars Racing Transformed, I cannot see the MSRP being any greater than an equivalence of $54.99.