Re: Question about [a planet] in Into Darkness (SPOILERS).
That was a fan thing or a book thing. In Star Trek VI there is some talk about a possible evacuation of the Klingon homeworld but it was never mentioned again. In TNG some parts of the capital are supposed to be very old so it doesn't seem likely it's a newly settled planet.
"Now and then we had a hope that if we lived and were good, God would permit us to be pirates." Mark Twain, Life on the Mississippi