According to this promotional sign, a new entry in Sonic video games is coming in 2015 for PlayStation 4, WiiU and Xbox One platforms. However, it is still not confirmed if this sign is authentic or not.
This promotional sign, which was first posted to Spindash.de (a German Website), was displayed last week at a toy fair in Nuremberg, Germany. The toy maker Jazwares was promoting a new Sonic toy line at this event.
The sign also lists the recently released Sonic titles, Sonic: Lost World and Mario & Sonic at the Olympic Games: Sochi 2014. The Sign lists the upcoming animated show as well, Sonic Boom, which is confirmed to debut this fall.
We all know that an unannounced Sonic video game will release sometime in future since Nintendo and Sega announced their partnership last year. It was announced at that time that three sonic games will be released on Nintendo platforms, i.e. 3DS and WiiU, two being recently released Sonic: Lost World and Mario & Sonic Sonic at the Olympic Games: Sochi 2014.