I've read that Air&Space Museum seems to be getting Discovery (how did that happen already?)
But A&SM already HAS a shuttle...the Enterprise.
So they're gonna fly Enterprise outta there to make room for Discovery? Why would they have TWO shuttles anyway? And where are they flying Enterprise? Who will be getting it now? Or are they keeping it, just someplace else?
Many questions, I have.
I have a few answers.

The Smithsonian is moving the Enterprise to make room for Discovery. They don't know who will be getting it, or if they will be selling it/giving it away or just loaning it to another museum.
How did they get Discovery? I assume they got first choice, although I'm not sure I would have picked that one.
See, the shuttles were not identical. Columbia was the prototype, but a few changes were made for the "production model". Challenger, Atlantis, and Discovery had noses that were a slightly different shape, and weighed less so they could carry more payload. Columbia's airlock was internal, while the others had one that was external for missions that involved docking to a station.
Endeavour is the newest, built to replace Challenger. It had new controls, new systems, and was in many ways the coolest of the shuttles.
The Smithsonian probably picked Discovery because 3 of 4 missions involving the Hubble Space Telescope were done by Discovery: Discovery launched it, and the second and third visits to Hubble were done by Discovery.
Also, the very last shuttle mission on the schedule is for Discovery. Last one to be decommissioned is a bragging point (just ask fans of USS Wisconsin: last to be decommissioned
twice).