Alright, we're doing some serious brainstorming here, which I like, but it makes me think...
To what extents will the planet (especially those more exotic ones) conditions actually affect our evolutionary track? In the beginning at least?
The rogue planet means that surface temperatures would be artic at best, eliminates day/night cycles, and some other things. We'll be reliant on geothermal. Having a volatile star would be especially interesting. Periodic burst of radiation would make the surface somewhat hazardous, but not unlivable. The aurorae would be spectacular, and some other stuff.
Alright, we're doing some serious brainstorming here, which I like, but it makes me think...
To what extents will the planet (especially those more exotic ones) conditions actually affect our evolutionary track? In the beginning at least?
Depends. Gravity and atmosphere will only really affect land animals, radiation will need some sort of protection before we can leave the water, and so on.
High atmospheric pressure would have significant effects on flying creatures too. It means that they can get a lot larger, but are quite slow. Low gravity + high atmospheric pressure should also have interesting effects on the waves.
What about a post-garden world (A world which formerly held life which already went extinct. We could have ruined cities and such.))?
Any remnants of civilization would not survive the time required for life forms to crawl back out of the seas. Unless we go archeological, and even then, it's highly unlikely we'll notice.
[Ninjas]