i just have some news vom WahooFitness, the guys who made the ANT+ Dongle for the iPhone.
"We're working hard on an Android solution, but I don't have any dates for you yet unfortunately. We know there are lots of folks with Androids who would love to connect to ant+ sensors so we'll keep you posted as we get closer to launch. Thanks for checking in!"
So there will be a Android Dongle!
But as the Android API, it should only work with Android 2.3.4 and higher. Since this Version, the "Open Accessory API" is included, which allows to use external products at the USB Port of the phone.
Stay tuned for more information, i'll post them here