I don't know if anyone is still working on new 1.7.10 packs, but you might want to look through the packs hosted by Curse. They have little icons in the upper right hand corner describing the pack's content: A wrench for Tech, a potion for Magic and even a small "FtB" if it's an official FtB pack. The "Hermitcraft" pack was released late last week, and I'm pretty sure I saw the "Mekanism" mod listed, for starters.
I'll venture a guess that you may not find a new 1.7.10 in any of the "official" pack lists since everyone seems to be working on 1.10.2 mods and packs now, but you may have better luck in the "3rd party" listings.