I was reading through and noted that DM-Horus was told by someone that OP3 was OP2 in 3D and that it was possibly Harky that said this.
As far as I know, Harky is not part of OP3's development team.
Second, OP3 is not at all OP2 in 3D. That's Levi's idea and something that he may want to take on at a later time (Levi, I know that you wanted to use another 3D RTS engine but OP3's may work better for you when it's done!).
OP3 is a new story alltogether.
As far as why they landed on a hostile planet, DM-Horus was pretty much on the right track when he said "something unforseen may have happened that caused them to land on a non-ideal planet". That is very much the case.
Furhter, some of OP1's planets weren't realistic. I know that... It does state in its manual that it is based on Science Fact not that it is Science Fact.
Also, OP3 will be looking back a little bit ... well... a lot at OP1. Not in its gameplay but in its backstory and several method's and that kind of thing. After we clear up these posts stormy, myself, TH300 and Zanco will release more information about what OP3 will really be like.
OP3 is also based on Science Fact but it is very heavily influenced by science fiction. And no, there won't be any new 'features' like the shields you see in Star Trek and Star Wars and that kind of thing (I remember someone mentioning something like that). There is shield of some sort but it is nowhere near that kind of technology.
... Oh yeah, I think Hooman was asking about OP3 being strictly based on a single planet in terms of gameplay (like OP2). No... it's not. The maps are not hard-coded to work the way we want them to. Textures and materials used on the map are entirely customizable by any user and easily done at that. There will be several planet 'styles' available so that new user-defined maps can be created that may not have been used for the campaigns (for instance, I don't think there are going to be any ice or icecap maps for the campaigns but the style will certainly be available). Also, if there is a maptype that's not available it will be easy enough to add the style to the game by adding it to the 'Logic Module' (to be described in another post).
Just thought I'd get that out of the way a bit... Hopefully I've answered more questions than I've created. Until next time!