The box in the Seibertron pictures explains it - they are a "preview" wave, before the full series are released in January.
Strange though, that these weren't noticed in Previews by anyone on the global fansites (as these are showing up at comic shops instead of retail stores).
I wonder if they will show up in our comic stores as well if they were from Previews/Diamond... or maybe Hasbro in American just sent them directly to specific comic stores.

Strange that they are all Decepticons in this preview series.