What we know so far of orbiting a planet (server):
You need to be going fast, sideways and up.
What I want to know:
Will it be possible to adjust an orbit? Can I put my ship in an elliptical or eccentric orbit?
Can I use aerobraking?
While orbital mechanics are amateur's nightmares, they do, in fact, serve a purpose.
Atmospheres!
Two words:
Air Friction.
Will this prevent me from landing a superdreadnought, or is it just there to make your ship glow upon reentry?
Thus, it may be fun to include standard hull blocks and specialized hull blocks (former can't take reentry, latter can).