While a number of Linux distributions are already shipping "GRUB2", version 2.0 of the GRUB boot-loader has in fact not been officially released. The proper GNU GRUB 2.0 release though is slowly nearing and yesterday marked the release of GRUB 1.99.
GNU GRUB 1.98
was released last March but finally landing as stable is now GRUB 1.99. GRUB 1.99 introduces the ability for this free software boot-loader to officially boot the ZFS and Btrfs file-systems, keyboard layout support, a parser for GRUB Legacy (GRUB1) files, new commands for EFI platforms, ACPI is being used for shutting down the system, simpler PXE image generation, a new automake-based build system, a new relocator, and menu hot-key support.
There's also many other improvements too, as talked about in the GNU.org release announcement