The first DRM merge for the Linux 3.7 kernel contained the bulk of the interesting activity for DRM core plus the Radeon, Intel, and Nouveau drivers. Read more in that article as with the Linux 3.7 kernel there's improved Radeon power features, Intel driver enhancements, and big underlying Nouveau changes.
As far as part two of the DRM pull goes, there's new Samsung Exynos DRM driver work for the Samsung ARM SoC graphics, UAPI disintegration bits, and various Intel driver fixes.
Among the Samsung Exynos DRM driver changes are support for Exynos5 HDMI, supporting the Exynos5 mixer, support for various other Exynos5 hardware features, and several fixes throughout.
As far as the Intel fixes that made it, there's DisplayPort fixes, GPU hang fixes, and various other fixed up bits.
This second pull has already been merged into the mainline tree in time for Linux 3.7-rc1.