Sorry, I need to check this forum more often...
Yes, atmospheric flight will be supported via dynamic LOD, and planets are procedurally generated, so no loading zones. Ships will need engines/thrusters configured for atmospheric flight or its a one way trip to the surface. Heat shields also help for faster and safer entry. Larger ships have to dock at a station in orbit for shuttle or elevator access to the surface. Atmospheric speeds are limited by hull stress and temperature tolerance, and engine thrust. Pod craft can also be "fired" down to the surface but its normally a one way trip. Weapon fire is the same, if a projectile survives atmospheric entry then it'll hit the surface normally (missile/torp), or with reduced energy (everything else). That much is finalized.
Not finalized: Atmospheric properties, atmosphere generation algorithms, realistic weather handling, and semi-realistic global atmospheric energy tracking, is all still being designed. Conventional aircraft handling is planned but not in detail, just VTOL ground units. Traditional fixed-wing aircraft and flying critters are looking less likely. The entire ground warfare aspect of OL is still being designed (roughly a hybrid between BF2/2142, MW3/4, OFP).
This hasn't been implemented yet. Our former lead programmer had planet generation and dynamic LOD working in an old test framework. Unfortunately all we got to see was screenshots, he completely disappeared before posting the code to CVS. The screenshots are still on the OL forums...somewhere.
-Burn
Lead Designer and Webmaster,
Openlancer Project