The Acer C720 Chromebook will be available shortly from Acer, Best Buy, and Amazon with a list price of $249.99. It's worth noting that this price is less than that of most tablets, an exceptional deal for a laptop.
The C720 is a fast performer due to this processor. The Samsung Series 5 550 Chromebook that's been out for a while is a fast performer due to its last generation Celeron, and the Acer C720 Chromebook is much faster with the Haswell version. Both of those Chromebooks have 4GB of system memory so its a valid comparison of the Haswell processor. It's worth noting that the Samsung Series 5 550 Chromebook is currently selling for $500.
Just plugged my Logitech C920 webcam into the Acer C720 Chromebook, opened the "camera" app and it loads just fine without any settings change or anything. Easy peasy :) .