Spend enough time in Portland in the US and you're bound to come across someone who works at Nike. Poke and prod them enough and you're likely to walk away with some insider knowledge.
So Nike is testing out several FuelBands on its Beaverton campus and the timing sounds about right as the original announcement came around this time last year. According to one source, the next-gen band is "thinner" and the FuelBand team is apparently wearing them en masse.
Someone else told me to look for variants in the clasp. But that's like searching for a needle in a haystack because so many Nike employees are wearing them. And each colourway of the FuelBand to date has a different coloured clasp. Both the original and original ICE bands came with a matte silver finish clasp, while the white ICE and black ICE sport chrome and black clasps, respectively.
Besides, asking everyone I saw to check out their FuelBand would be just plain weird. Anyway, a newer and thinner FuelBand is floating around the States now.