Yep, they mentioned that at BotCon last year... telling us to block our ears if we didn't want to hear comic spoilers.

Leader Wave 1 - Megatron (Gen1-ish tank from Legends game)
Leader Wave 1.5 - Megatron (Armada tank - redeco with new head).
Working Treads on tanks. Gen1 Megatron will come with an Autobot Sticker for those wanting to replicate the IDW comic.
Gen1 Megatron was originally meant to come out with Jetfire in 2014, but was pushed back to early 2015.