That was my immediate thought. Since they're coming out earlier than expected, Combiner Wars hasn't happened in the comics yet. Wave 2 (maybe even later runs of wave 1) will probably come with the comics.
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If we take a past Generations toy as an example -- let's go with Rattrap -- he was released mid 2014, and yet came with an Comic Issue first released in December 2013. So I'd say there's a pretty good chance we'll see Comics in later waves because Hasbro obviously have no qualms including Issues that are 6+ months old with their toys.