So should i get the 13 MBA now?
I say you can't go wrong with one, though it's up to you if you want to wait.
Even though I bought a Mac Mini, I like the current 13" MBA. You have the return of the backlit keyboard, a new line of processors which are quite an improvement over the old ones, and a Thunderbolt port.
On the flip side, the new Ivy Bridge processors will support OpenCL and improved integrated graphics and most likely USB 3.0
Other than that, I don't see 8 GB of RAM on an Air but maybe I'm wrong.