Am I to take it that the Mancubus now shoots all three shots simultanously (according to the explosions in that screenie)? To be perfectly technical, Mancubus always shot three volleys of double blasts, one of which was aimed slightly to the side (I believe it was left/right/left from the view of the Mancubus) and one directly at you. This looks like just a demo, though, so I hope this is needless worry.
Also, I must say I really like the BFG hit. What'd be even cooler (and truer to the original) is if you could have all the explosions after the range hit go off at the same time. Sure, it'd clog the message screen like nobody's business, but it feels oh-so satisfying to hit absolutely everything at once. In any case, it makes me wanna shoot the BFG more, just for the explosion. (Also: NOOOOOOOO THE MOOOOOOODS)