mroberts said:
Does that also mean that the "upgrade kit" is a cheaper alternative to the PMU if I want to run the OSD?
That's kind of the question, I guess. I haven't seen anything from DJI, but someone on RCGroups reported that DJI Germany emailed and told them you could plug the iOSD into the GPS port on the upgrade board and then plug the GPS into the iOSD, since they were all CAN BUS connectors in disguise. I haven't seen anything "more official" on that (e.g., in a manual or other documentation from DJI), though.
If you wanted to use the iOSD mini (or MKII) as well as the new BT module, in theory you'd need a CAN BUS hub from DJI as well as some kind of cable that would connect the normal "clip" style CAN BUS connector on one end with the "tab" connector that's on the upgrade board GPS port.
But as I said, all unconfirmed by documentation at this point as far as I know.