Hi Guys, Just ordered a MBA 13", i7, 8Gb, 256Gb and sold my rMBP. I need to send the rMBP before the MBA arrives. How can I migrate everything without installing everything again? Thanks.
You sure can. Apple makes it so easy to move from machine to machine, upgrade OS or change drives. I haven't reinstalled anything in the six years I've been with Apple.
As Hellhammer said, when you boot the new Mac, it will ask if you want to copy your data from a Time Machine backup. Do that.
Do not try and boot into Recovery and do a full Time Machine restore from your old system's backup. It appears that the stock 10.8.4 won't run on the new Air.