BBone Black's chief advantage over RasPi is that BBone has far more I/O pins so it's a superior platform for hardware development. There are some lively discussions at raspberrypi.org and element14 comparing the two.
The new Beaglebone Black seemed to be making quite a stir. The mustache camera at the Ti booth is powered by one.
From what I've heard and read about it, it's potentially a rival to the Raspberry Pi in terms of cost and capability. The Beaglebone is open source, but the Pi has a few more connectors built in.
I've been evaluating the Raspberry Pi for a couple of weeks now and I find it relatively easy to use (considering that it's Linux powered) and has quite a bit of power for the size and cost.
I'm anxious to get a chance to look closely at the new BBB and see how it measures up. I tried to find someone to order from while I was down in San Jose, but at the time, everyone was sold out. I'm sure they're available now though.