Yes, we could use a sample or two. Please upload them and send email to support so we can check them in.
Under the hood there has been quite a bit of work for 10-bit support, but it's not yet completed. In the current release builds, 10-bit video is down converted at decode time to 8-bit and the rest of the processing chain is 8-bit. We've removed this limitation so that the video remains 10-bit coming out of the decoders. The internal decoded frame formats now support formats from 8- to 16-bits. All the encoders, which are capable of supporting 10-bits, can output 10-bit encoded files.
What's remaining are all the intermediate filters such as chroma converters, resizing, deinterlace (does 10-bit interlaced exist?), etc. Then the glue for wiring this all together needs to be completed.