If you want some more info, pick up the Nov issue of RC Driver, they have reviewed the 2350 in it. I just got it in my mailbox today and after reading it I can confirm:

1. The 2350kv rated motor will indeed go a little faster then the HP's 2200kv in 4s in stock truck form, around 47mph vs 42mph
2. The Q-base ESC is compatible with the Castle link and field link programming card
3. The chassis all around is exactly the same as the HP