There isn't anything particularly exciting in Linux 2.6.37-rc2, like the very amazing patch talked about earlier today that dramatically improves the desktop responsiveness/interactivity under system load, but with the 2.6.37 merge window closed it's all about bug-fixing. There's also some staging drivers that have been reverted.
"And it all looks the way I like to see my -rc2's: nothing really interesting there. We had a SCSI calling convention change patch that got punted due to some discussion about details (and which I'll probably accept for -rc3 with the fixed model).
In fact, the biggest change in the diffstat is just due to some staging driver reverts. So hopefully this whole 2.6.37 release cycle will be as painless as it looks so far."
The Linux 2.6.37-rc2 release announcement can be read at LKML.org.