Some of the June covers are beautiful but very spoilery for characters and events, not only in June but for the current Dark Cybertron event.

June Solicits from IDW, sadly I couldn't find the information at IDW, so had to link via Seibertron.

In Summary:
RiD #30 (Dawn of the Autobots)
MtMtE #30 (Dawn of the Autobots)
Windblade #3 (Dawn of the Autobots)

Re-release of Spotlight Drift (I can only assume due to the Movie/future McCarthy releases)

Dark Cybertron TPB #2

Transformers Classics #7

All Hail Megatron deluxe limited release (signed by Hutchison and McCarthy and only 350 copies)