Concept art for FOC Snarl is up (link to TFW2005). It's up at seibertron.com and tformers.net too.
The design looks pretty interesting, not sure how it could be translated to toy form but after Animated and Prime it seems possible.

So hoping the rumours of a full set of Dinobot toys are true, I really want an updated Sludge (Voyager would be nice, but Deluxe is still cool) and Snarl.