The GStreamer 0.10.30 release isn't particularly exciting, but depends upon updated versions of GLib and automake while carrying just under 36 official bug-fixes. The release announcement for GStreamer 0.10.30 can be found on the mailing list while on their web-site are the technical release notes.
With the updates to the GStreamer Base Plug-Ins, the Optimized Inner Loops Runtime Compiler (Orc) is used for SIMD and other optimizations while the dependency upon liboil has been dropped. However, this move from liboil to liborc won't result in immediate performance improvements, but this is expected to be a focus in future versions. This release also adds RIFF mappings for the newly opened up On2 VP8 codec along with the VP6F On2 VP6 Flash support, support for RGB/BGR with 15 and 16 bits, mappings for new EXIF/XMP tags including device / geo-location / image orientation, Ogg VP8 mapping support, and quite a few other changes. Officially there are 51 bugs fixed in this area of GStreamer. The release announcement can be found on this page.
The GStreamer Good Plug-Ins also migrates to Orc, carries various updates, and offers up about 50 bug-fixes. The gst-plugins-good update release notes are here.