Engine Upgrade is a must, and a great new for the community, it will give the Devs a lot of features to work along with bug fixes in the engine and optimization. Maybe not in the user-side but is a step forward in some future features (like 100 player servers and larger maps, thing that Choppers will need). And related to the de-tracking feature, really you complain about such a beautyful feature?
Helis will come, I dont understand that rush for them, they are working hard on development and delivering a great game at the same time. Give them congratulations instead of rushing them with useless Hype.