I completely missed the "1/20" discussion yesterday, and failed to notice it on the product page as well because I went straight to the spec sheet.
I think they indeed only refer to the top bar. It's pretty much the exact same functionality as the 1300, they simply re-arranged the segments of the circles and turned them into bars.
That top bar is going to fill up from left to right in the first half of every second, and then empty out from left to right during the second half. So yeah, 20 steps per second. Pretty useless though, it's just a visual gimmick.
@Viper45 : I think it's not just a bad PR photo. All 3 variants have the exact same issue, and you can even see the difference in the shape of the faceplate and the progress bar throughout the manual. I think that unused corner just looked too weird, and they added a black part on the LCD to mask the issue. I wouldn't be surprised if the watch actually looks like that once it becomes available.
Another thing that now bothers me is that it has the "WR100M" text on the top of the faceplate ... and a "WR" logo on the bottom as well. That's nothing that can't be sorted out with some goo-gone and q-tips, but it shouldn't be happening in the first place.