I could swear somewhere Apple stated it could be extended with new firmware in the future and implied that meant potential support for other codecs. Maybe I just imagined that, could be wishful thinking playing tricks on my memory.
Please post a link from Apple that states this or a report from WWDC claiming this.
I've seen a ton of horribly written "reviews" of the MacPro7,1 that make wild claims about Afterburner and direct links to RED just because both are video-codec based FPGA's. It's one thing to make parallels between the two for cost analysis (the RED ROCKET X costs almost $7K). It's an entirely different thing to draw conclusions that RED WILL make Afterburner work with R3D, or Blackmagic WILL make BRAW work with Afterburner, etc.
(How a "review" can be written before the author actually gets their hands on the device is another topic for another day. It's a preview, at best.)
This is what is published directly from Apple about Afterburner:
Afterburner
ProRes and ProRes RAW accelerator card
PCI Express x16 card
Accelerates ProRes and ProRes RAW codecs in Final Cut Pro X, QuickTime Player X, and supported third-party apps
Supports playback of up to 3 streams of 8K ProRes RAW or up to 12 streams of 4K ProRes RAW
Introducing Apple Afterburner. Blaze through 8K video.
Created to transform the workflow for film and video professionals, Afterburner allows you to go straight from camera to timeline and work natively with 4K and even 8K files from the start. No more time-consuming transcoding, storage overhead, or errors during output. Proxy workflows, RIP.
Cut to even more creativity.
Afterburner is a hardware accelerator card built with an FPGA, or programmable ASIC. With over a million logic cells, it can process up to 6.3 billion pixels per second and is capable of handling up to three streams of 8K ProRes RAW or 12 streams of 4K ProRes RAW. This means you can free up your cores to enable even more creative effects and processing.
Up to 3 streams of 8K ProRes RAW video at 30 fps
Up to 12 streams of 4K ProRes RAW video at 30 fps
Up to 16 streams of 4K ProRes 422 video at 30 fps