Not that it's directly relevant to the question, because standard 10.8.2 did come out before the Mac mini (Late 2012) and, as folks have noted, standard 10.8.2 couldn't be installed on on a new mini, but mine, purchased in December actually came with 10.8.1 preinstalled. I double-checked, and my recovery partitition, which I recreated using Internet Recovery after inadvertently losing it when I did my DIY Fusion Drive is still at 10.8.1.
But 10.8.3 should be universal now for the machines that are out.