I thought I was aware of all the most common, or popular codecs. That's a new one on me. So my educated guess is that it won't be added.
Can you make a case for it?
When I Googled "MPC codec" what I found seems to say that it is not a codec as such, but rather a pack of codecs, which includes things like OGG, MP3, AAC, and some video codecs, two of which are already on the B2. If you have different, additional information, please tell us.