If a prone character is teleporting, say with feystep, is it possible for it to arrive as "standing" in the destination? What about if he's using some other teleportation power? Does this cost nothing, no action or so on?
Does the feystep power say anything about removing the prone condition or allowing one to "get back on their feet"?
Q: Can I use teleportation to stand up?
A: No. Standing up from a prone position requires a move action, even if you can teleport to a different location.
Prone is a condition that is placed upon a person. In order to remove this condition, you can Stand Up as a Move Action as described on page 292 of the PHB.
Unless a power/feat/ability specifically says that it removes the prone condition or that you can use it to "get back on your feet" (in the case of Stand Up), then it does not.
Does the feystep power say anything about removing the prone condition or allowing one to "get back on their feet"?
I think this is a perfect example of what folks mean when they say "4E =/= D&D". Back in the day of Basic D&D or AD&D, something like this would just be left up for the GM's interpretation-- "well since you can teleport 25 feet in any direction, sure, I suppose you can decide what direction you are facing when you arrive".
But now prone is a condition that has to removed by some exact action, regardless of the flavor text of or a clever idea of how it is being accomplished? Seems a bit stifling to me, but then so do roles, template-premade-characters, and necessity of a board. I guess 4-E is still a role-playing game, but the emphasis is definately on the "game" aspect when it comes to things like this...
I could see clever stunts used to overcome this. Say you teleport to a spot 10 ft. above the floor, then use your Acrobatics to overcome the falling damage, If you succeed, you land on your feet? Seems believable to me. Of course, the drawback is a bit of falling damage if you fail.
A similar stunt (without the teleport) would be to crawl (really roll, I guess) over a ledge, then twist during the fall and land on your feet.
In other words, convince your DM, and it works.