Just played Saigon a good deal and wow, that is one kickass map. That one featured the tunnel and blown up city. Its instantly catapulted to one of my very favorites, the only one that I like more is Cambodian Invasion. Saigon really forces you to have infantry combat. Had some great shootouts with people in the sewers, lots of variations. Great to be a mine layer down there, and that machine gun they carry is murder in close quarters.
That new truck is AWESOME! I got in with an other guy and zoomed down the roadways while a GI helicopter was shooting after us. It reminded me of COD, but it was unscripted.
Vlad, never heard of a demo being made. Doom and I are of the minority that BFV is great though. I highly recommend it.