Who's this nose belong to 

Could that possibly belong to a Nimrod? That's the only plane I can think

 of that had a smooth cockpit glass design and low nose....

.

 Looks like one of the 787s. Which one I've no idea.

..... Could that possibly belong to a Nimrod? .....

Surely not a Nimrod ..... too many windows in the fuselage .....

Why not the Sukhoi Superjet 100 ?

 I think the bottom of Superjet is more flattened at the front, whereas the object on the trailer is more of a true circle cross-section. Also the missing radome appears to extend further back than it would on the Sukhoi.

 The sheds behind the nose section look like those at Everett and the windows down the side of the fuselage look big enough to be that of the 787. If I was a betting man i'd say it was an A380... only joking.... it has to be the 787!

I think its cute where they blind fold the nose section at Airbus and Boeing before the plane is born LOL :0)