Most of those are just test builds, because there was some actual component development involved this time. Putting them right in the beta dir probably wasn't the best idea at least.
Either way, the current changes I recall (which should be about final for the release now):
1. Duration fix for matroska files that have no DefaultDuration set for the video track, and some insanely high time scale values in the stream (the files were apparently produced by x264's matroska output). This caused a divison for the frame duration on the tryout side to end up with 0, that seems to just get "corrected" later to the default for 25 fps.
Added a workaround that sets the duration to 1 in this case, though I have no idea why it is not just ignoring the zero value altogether when it should be using the times it gets from the splitter anyway (it does get ignored fine when it is above 0).
2. Adjust CCCP Settings and VSFilter for the new pre-buffering changes. Default is still no buffer, and the checkbox sets it to 10 when enabled.
The usual fun of checkboxes stand there, namely that all current values that aren't 10 are treated as 0 and written as such when you apply.
3. Our beloved 10-bit stuff, limitations of which are mostly described at the end of this post
. One related thing to note is that it also involves altering the color space matching priorities for 420P ("YV12"), to prefer YUV formats before RGB.