I had an F31 demo a couple of weeks ago and it came with the Pro Media pack. I was pleasantly surprised to find that it did play video from a USB no problem at all.
I tend to just copy over my entire iTunes music folder on to a USB and plug it in under the armrest. You may know that occasionally iTunes album purchases include a video or two as 'free' extras. The Pro Media on my 2011 E91 just used to ignore these but the Pro Media on a 2012 F31 just played them.
I'm guessing it's down to which file formats are supported. Check your handbook.