Bandai Namco has already released one entry in the Taiko no Tatsujin series for Wii U. A second game could now be in the works as well based on a recent discovery. An official Taiko no Tatsujin URL, wiiu2.taiko-ch.net, currently indicates that the website is a “test page”. That’s exactly the same message users were presented with prior to the first Taiko no Tatsujin Wii U reveal. Also, if you try another domain such as wiiu3.taiko-ch.net, the page simply won’t load. This suggests that the “wiiu2″ subdomain was created with an intended use. So is this a sign that a second Taiko no Tatsujin Wii U game will be announced soon? A reveal around TGS would certainly make sense. Source

Read more at http://nintendoeverything.com/taiko-no-tatsujin-url-hints-at-new-wii-u-game/

keep in mind the first wii u one sold 160k(according to vgchartz and wasnt it a luanch title there) so i think if this does happen it could sell double possibly :)