Looks like drittal was right. Ram appears to be adding a hood scoop to increase power output for 2018. The grill shape looks like it may resemble that of the 1500. Link
I personally don't see the benefit of a scoop on the Ram since it has active air and can pull air from behind the grill (a high pressure zone). I think they may have a new hood design that replaces the shark gills it's had since 2010.