I confirm this. I configured my new MP (2012 6 core 3.3) with a 512 system SSD and another 512 SSD for media. I hoped this would speed up some aspects of Cubase, specially the slow save times as a project gets bigger, and after slicing drums. It didn’t. The problem is Cubase, not the disk drive. It takes nearly 30 seconds to save a project with sliced and crossfaded drums, whether I use the SSD or a SATA internal HD, even though the actual project file is only a few MB.
I also run Final Cut Pro 10.1, again having the media on SSD makes very little or no difference.
The faster graphics card (5770) in the new mac speeds things up compared to my older 2008 8 core MP 3,1.