Deep Striking vehicles count as moving at Cruising speed. But as already stated, Deep Strike rules themselves specifically prohibit any unit that deep strikes from assaulting on the turn it arrives via deep strike unless clearly stated in it's special rules. And a squad arriving in a deep striking transport is considered to have arrived via deep strike. Really, it's that simple.reegsk wrote: It does specifically state that units embarked in Land Raiders and Stormravens cannot assault the turn the vehicle deep strikes. It doesn’t specifically state that with the Land Speeder Storm, and it’s Open Topped, so I can see it as a viable question. But doesn’t it state somewhere in the rules that a vehicle which enters via Deep Strike counts as moving Flat Out, and therefore the units wouldn’t be able to disembark at all?
Regarding Descent of Angels and transports. No, IMO, it doesn't work. Outflank specifically states that it is conferred to the unit's dedicated transport. Without that particular line in it's rules, Descent of Angels is not conferred to a transport.