Looks like they finally provided clarification regarding tracked vehicles:
"Q: “Tracked Vehicle” is listed on one of my unit cards. Are there special rules for tracked vehicles? If so, what are they?
A: Yes. Tracked vehicles, though considerably powerful, are not as agile as walkers. Due to their cumbersome nature, tracked vehicles cannot move diagonally."
They also indicated that the Nikita is supposed to have the Reload skill for its weapon.