Being too old in the tooth to be anything but cynical. I suspect people that 'armed assault' (tm). Will be correctly versioned and percieved by us as OFP1.5.
My gut tells me that this is OFP with re-rendered eye candy to bring the engine up to newer graphics and that will be about it. It will be (my view) an interim release much like Resistance. New improved everythings but nothing radical engine wise.
Bis long intended to improve the sound qualities so a bit there too. And some improved online play. If your read between the lines of the highlights, bis aren't saying there's anything new, engine wise. And frankly, with their concentration on VBS1 which has made inroads with reliable profits from non gamers (read non cd pirate regimes), the emphasis on something completely new, isn't there.
The latter sentence goes a long way to explain Codemasters disgruntled exit from the scene.