Shall I wait for the new slimmer Macbook Pro or get an Air now?

If the rumoured slimmer Macbook Pro uses Retina Display, will it get as hotter as the new iPad?

I am still thinking what will the Macbook Pros differentiate with the Macbook Airs? Only a little bit powerful and with more ports?

Based on the predictions of Marco:

The MacBook Air probably won’t see an update until those 17-watt CPUs in June. This upgrade will probably also be a minor speed bump.

So does it worth waiting for another few more months or get the current Macbook Air where I can have some discounts on Amazon at the Spring Savings Event?

Any ideas?