At E3! Hollywood Bowl amphitheater! UPDATE: We've got some more info on who's behind all this.
UPDATE: #PlanetChat's own dilbert627 pointed us out to a link with some more information about this shindig.
The concert is set to happen at the end of E3, most likely on the weekend after. The event's organizers include music-head Tommy Tallarico and Producer/Composer Jack Wall.
More info can be had at Music4Games, so do read it up.
Game Informer says:
Video game and music nerds collide at next year's E3. Orchestrated renditions of famous video game scores are being planned for an event at The Hollywood Bowl amphitheater.
No word on times or tickets yet. Thanks to GC Cafe for the tip.