Here's a neat video of some Russian paratroopers practicing their "deep-striking" skills. Check out how the tanks have a rocket-assisted landing rig built into the parachute system. Pretty cool, even if they aren't the size of Land Raiders. :)
The amount of smoke kicked up by the rockets would also seem to suggest that deep-striking tanks or pods in 40K really should get smoke-cover during the turn that they 'land'.
I don't think the Bradley can handle firing its gun in water, as it has enough of a tendency to roll over as-is.
Seems like the Russians have some good capabilities for rapid-deployment. Which would make them difficult to shift in a Falkland Islands invasion type of situation. The British had the Scorpion light tank back then (which served them well). But those have (like the US Chaffee) long since been retired, and no MBT could handle terrain like that found in Crete, the Faulklands, or even the more mountainous countries in Eastern Europe, like Serbia.