I think a points drop across the board should be in order.
The Kroot need to have their ability tweaked to apply to ALL Cover, not just forests. Maybe they could have the Shaper give them a +1 Cover bonus, perhaps. Maybe give them Fleet or Feel No Pain or something once they eat something? That could be a really fluffy change.
While I like the idea of the Pulse Rifle getting Heavy 2, thats not going to happen due to that being their main troop gun, which seems to be mostly Rapid Fire. Maybe give them a squad leader upgrade that gives them +1 shots, or something. Could also see the Pulse Carbine be Assault 1, Small Blast.
Markerlights need re-worked. The idea is sound, but it's really book-keepy, which is a fine idea but doesn't seem to keep the 'simpler, faster play' feel of 5th. I honestly am not sure how I would change them, though. Maybe make the abilities per squad, and not per individual weapon.
Vespids need... something. Maybe make them able to better Deep Strike, like Divine Intervention but with shooting, or something?