Monolith Soft stated the below on their Twitter account and it may be hard to understand because it is translated from Japanese to English.
I’ve updated the page of the “Welcome to Monolith Soft” [HP] soft monolith. September 20 (Thursday) held “Tokyo Game Show 2012.” We will report Riki is enthusiastic this year. Do not miss it!
Monolith Soft is telling people to not miss the Tokyo Game Show that starts on September 20th. Does this mean Monolith Soft is going to unveil their Wii U project? We will just have to wait and see what comes out of it.