However, as noted in the release announcement, this release isn't particularly exciting. There aren't any major bug-fixes or changes but just the usual assortment of updates and other work. "Pretty small, all in all. I'd obviously prefer it to be even smaller, and I actually dropped a pull request or two, but for being -rc4 this is by no means horrible. As long as it keeps shrinking, I'll be happy."
The Linux 2.6.38 kernel already has a lot of exciting new features and so far it appears to be in good shape.