I'm really digging the new droid. The thing is adorable. Plus, it looks like it would be a fairly easy build for a newbie in R2 building... I mean, it's just a ball with a head on top. The only problem I see with building the thing is that according to the concept notes, supposedly the head "magically" floats on top of the ball... Hopefully that was changed for filming, 'cause that would be pretty much impossible to replicate in real life.
But yeah, the trailer is pretty sweet. I'm not ashamed to admit that I screamed like a little girl when the Millennium Falcon appeared and the music started playing. I'm also really digging Daisy Ridley's speederbike...