TGS 2014 Sonic Boom Live Stream
The last day of Tokyo Game Show 2014 SEGA held a live stream of Sonic Boom (known as Sonic Toon in Japan). They showed a few new cutscenes and Wii U/3DS gameplay video with the commentary of Takashi Iizuka. You can view the recoding below.
Also you can see the separate videos of Wii U and 3DS versions' gameplay in the full story.