Linus Torvalds released the Linux 3.9-rc2 kernel on Sunday evening through this mailing list message.
Fortunately, for this stage in the release cycle of Linux 3.9, things are looking fairly good. "Hey, things have been reasonable calm. Sure, Dave Jones has been messing with trinity and we've had some excitement from that, but Al is back, and is hopefully now busy virtually riding to the rescue on a white horse. But otherwise it's been good for this phase in the rc window."
Standing out this week were wireless new network drivers, a new ASIX AX88179_178A USB Gigabit Ethernet controller driver, DRM updates, Btrfs updates, ARM updates, and the assortment of other stuff. Linus says there is "nothing horribly scary" with this new release.
There's lots of new features to this next kernel release while there's also some missing functionality.