It appears to be a custom form of the Decepticon insignia, like how the Wreckers carry a hammer on their Autobot insignia (why a hammer, I don't know). http://www.tfw2005.com/transformers-news/attach/7/3/2/3/1/8168256035_1d904dc375_z_1352428764.jpg http://tfwiki.net/wiki/Insignia With TF2 the Con insignia was made of spikes, like on the Fallen's face - so it could possibly hints at some new faction that might appear to give the Autobots trouble in TF4. I wonder whom this could actually be... Anyway, the logo is rocking. Great to finally have some TF4 news.