The Wii U game of Sonic Boom, called Sonic Boom: Rise of Lyric, is going to be released one week earlier, moving from November 18th to November 11st, as announced by the official Sonic the Hedgehog Twitter account.
No reason was given, however, it looks like the reason was because of Super Smash Bros. for Wii U, where a lot of places are saying it will be released this November 21st.
You can read the official announcement below:
Sonic Boom: Rise of Lyric will be available in North America one week early, on November 11th! pic.twitter.com/F9CA8LwqCF
— Sonic the Hedgehog (@sonic_hedgehog) September 18, 2014