I'm new to Squats, only have about four games under my belt and lost three of 'em, so the usual grain of salt and all that.
I do agree that cyclops missiles are probably useless the way they are now. Originally it was designed so the Cyclops had some anti-infantry potential to keep orks or whatnot swarming it while it did its work of dropping titans and superheavies, but 1 BP per means that if there were an option not to take them and make the Cyclops cheaper, I know I'd take it. Thoughts on MW? IC? I know both are pretty rough, but if you're looking to make the thing 500 points.
Given my previous post on the land train I can only agree with making the Land Train's armament cheaper - I know a lot of folks said it gets good beyond the 500 point range but I feel like a lot of competitive games are at 3k and can't take >500 point superheavies that aren't Reaver Titans too seriously.
Making gyrocopters scouts makes less sense to me than making the robots scouts. The army really needs some. And I reckon thunderfires are fine the way they are - it's two models that can't move with a crap armor save.
I still think Thudd Guns and Mole Mortars are overcosted by a bit, but I know that's not part of the purview of the 1.4 criteria under review. And please make moles/termies/hellbores deepstrike, right now it's just lackluster in use.
Just my two cents - you asked for people's input

Giving it my best shot on a Thursday morning with a broken coffee machine!