I haven't seen anything so far in any of the info they have supplied that indicates you need to walk around to complete anything in colonisation, so hopefully it will be both, Colonisation to me at the moment appears to be a glorified delivery CG with the end reward being a new stations/stations, so no reason Horizons only players can't take part. The question of whether we will get Odyssey only stuff probably hinges on what we are after, new atmospheric planets and stuff would definitely be an Odyssey only expansion, but there's no reason that stuff that can be done without legs should be Odyssey only, in fact that would probably be very difficult to do since both games use the same engine. At the moment we have content blocking based on assets that keep Odyssey and Horizons in separate areas, but trying to block something that isn't asset based but process based would be very much more difficult and complicated in the game engine.