We just got a few minutes with Fitbit's new Flex activity tracker. From the looks of it, Fitbit has basically re-engineered the One, made it smaller, taken out the altimeter and shoved it into a wristband.
Double tap the band and a stream of five tiny LEDs notify you of how many goals you've reached for the day. So if you've only hit two of your five goals, then only two LEDs will light up. The band itself seems a bit chintzy, but it's infinitely adjustable for any wrist size.
When asked why Fitbit was making a move to the wrist, I received a pretty bogus answer about not having to worry about the device being on the user's wrist. The fact of the matter is the company is basically scared that it will lose ground to the likes of Jawbone and Nike. But we'll reserve judgement until the Flex ships in the next few months.