Yes, the EK4 V2 has all the upgrades you mentioned, supposedly including some other things such as 2-grub drive cups and thicker shock towers.

There is also news of Thunder Tiger giving away free upgrade kits to those who own the EK4-S2 version 1. Some of the upgrades included are the cooling head, diff cases and screws, carburator.

And yes, it is insanely fast- change to a 18T clutchbell and it's even better. Keep your eyes peeled for the Two-Speed Kit soon (and Three-Speed in the future).