Is there any android support for bicycle sensors? I've seen some Bluetooth Smart (4.0) technology for tracking tire rotation rate (bike speed), peddle rotation rate (cadence) and even heart rate monitors.

Some heart rate monitors are supported by google mytracks now.

Anybody aware of support for cycling sensors?
Not aware, but a quick check in the playstore shows there are several bicycle apps supporting "ANT+ sensors" for speed and other things. Take e.g. a look at IpBike ANT+™ Bike Computer, ANT+ Bike Display Demo, IpBikeKey, and others. Starting point: ANT+ Playstore search :)

Please note that, as Ifor pointed out in his comment, that this requires special support from the Android device's hardware. Details can be found e.g. at the IpBike page.