My main complaint with the gen 1 device is that even though it has a mini USB port, it can't be charged that way with any standard cell phone charger. It has it's own charger and connection, which means one more charger that I have to travel with. I haven't seen anything that says if this has been changed with the updated device.
Have you see this line (see the Amazon kindle listing): USB Port: USB 2.0 (micro-B connector) for connection to the Kindle power adapter or optionally to connect to a PC or Macintosh computer. That suggests to me that it can be charged with a computer or other USB charger (probably an iPod charger for example).