I don't think Jawbone would make something that uses disposable batteries. I'd imagine one of those caps simple swivels to reveal a micro-USB.
I'll be buying one of these. Partly because I think the technology is fascinating, but also because I really could use something like this for my life.
I 'm planning on picking one of these up as well.. might have to wait for a coupon though.
I was hoping they'd pop up at my local best-buy when they had the 20% off phone accessory coupon floating around, but it didn't happen looks like we've still got a few days before it's released though
I just picked mine up from the Apple store yesterday. Apple is putting them on shelves early.
BTW, I love the device! It's comfortable and it's waterproof. The device charges via usb. The Jawbone tip comes off, and reveals a 3.5mm jack. That connects to a USB cable.