We informed a good while ago that there would be a sub-plot involving Ironhide, Optimus, and Lennox. But when the comic adaption was leaked, it was not Ironhide who was travelling with Optimus and Lennox, but Ratchet instead. This just confused me. I'm hoping that it winds up being Ratchet who is in the sub-plot, and due to the recent footage of him and Optimus Prime on the moon, it looks that way.
I think it's... Optimus + Ratchet go to the moon (searching the Ark) Optimus + Ironhide + Lennox go to Russia ( Spoiler where they are ambushed by Shockwave & Driller )