OK, great info.
I was checking with B&H, and here is my finding so far: I see that the speedbooster will need an additional power as the 2.5k is passive mft.
Quote: you need to use an optional 5 VDC battery connected to the Speed Booster’s Micro-USB socket. Its a pitty, O already have a rig with swithtonic v mount battery, for the cam and the external monitor, for the speedbooster I will need another battery…. hmmmm.
Also the auto focus will not work. Not a huge deal, but do think its a nice extra feature on the ef 2.5k.
Hope Blackmagic will update to active 2.5k MFT soon.
I do think the 2.5K is one of Blackmagics best and stable cams, no fnp at all. I used it for 4 tv commercials and a short documentary so far. just great! I was going to get the 4K, but the FNP really scares me as I shoot lots of evening scenes which go really fine on the 2.5k.