To be honest, not a fan of especially the atlas mini there, the mk4's don't look too bad, but from a tactical standpoint those huge weapon housings are too big for the weapons they would have (difference between mk1, what they're putting in, and mk4, those mini's, is larger arm weapons apparently), they'd be alot easier to hit that way.
as far as mini's go, what I've noticed is that they made some good changes in some of the mini's, like the spider light mech, it looks alot better than the old TRO, the two mk4's look pretty nice, but the differences are in loadout and there really isn't a reason to have any larger weapon housings than they have.