It's from the banner for an online article a few weeks back. This weekend at The A.V. Club: All Thrones, all the time · Newswire · The A.V. Club I haven't been able to find an original so I assume it was done in-house for the website. But yeah, I saw it and thought "new avatar!"
Hey Mobb One, could you help me out and get one of those Autobots Posters by Tom Whalen for me also? thanks