I was also waiting for the quad-core + discrete option. BUT after purchasing an Air with Intel 4000 earlier this year, I have to say I am pretty happy with it.
Also, at least it comes with 512MB memory per apple site:
Testing conducted by Apple in October 2012 using preproduction 2.5GHz dual-core Intel Core i5-based Mac mini units with Intel HD Graphics 4000 and 512MB graphics memory, and shipping 2.3GHz dual-core Intel Core i5-based Mac mini units with Intel HD Graphics 3000 and 384MB graphics memory, all configured with 4GB RAM. Portal v(5042)(620) tested using LaserStairs.dem, medium graphics quality, no anti-aliasing, trilinear anisotropic filtering, at 2560x1440. Half-Life 2: Episode Two v(4295)(420) tested using storm.dem, medium graphics quality, no anti-aliasing, trilinear anisotropic filtering, at 2560x1440. Performance tests are conducted using specific computer systems and reflect the approximate performance of Mac mini.