I'm glad I'm not the only one that saw this too. It was one of the first things I noticed. It seemed....very snappy...more so than the GSM videos I've seen. I'm not sure why or how...I can't imagine LTE having an influence on the actually quickness of scrolling around within ICS. Maybe it's a resource thing? If it is, I would think LTE would be more demanding in the sense of resources. Is it possible that the 32GB internal storage has an affect on speed maybe? Improved read/write speeds over the 16GB GSM version?
I only bring that up because, similar things are observed with Solid State Drives. I have a 30GB SSD drive with some nice read/write speeds, but the larger versions of my same model like the 120GB version, have much more cache...faster read and write speeds. Maybe something similar is going on with the LTE version of the phone.
It will be interesting to see a comparison in benchmarks with the GSM vs. LTE.
Meh, wishful thinking probably, but if this is what's coming our way (soon), snappier speed and all, then I'll be more than happy, even though the wait has been grueling thus far.
EDIT: Also I noticed that the phone is on the new 4.0.2 version. Maybe this update brought on some improved speeds and HW acceleration? If so, then awesome, as that is the first of many updates and improvements to come throughout the life of the Galaxy Nexus. The Galaxy Nexus out right now, will pale in comparison to the Galaxy Nexus a year from now.