Arduino-like cards with built in Bluetooth

Summary: LightBlue Bean by Punch Through Design seems the most promising.

All cards untested by me at this point in time.

It seems to me that a good use case for the Arduino is as a very low power device that just wakes up briefly, to send some sensor data to a server. Sensor data could be different air quality measurements such as humidity, or certain gases. As long as the bluetooth can connect relatively quickly on wake-up, you ought to be able to make sensoring arduinos that can last for years on a battery. So you could place them in places that are difficult to reach with electrical power.

Here is what I have found after a brief search, and as I said I have not tested any of these:

Bluetooth Bee - Standalone (built-in Arduino) - priced at $23.50 when I read the link, needs a shield in order to be programmed, it seems

RF Digital RFduino RFD22102 - Micro Center - at $21, needs an additional USB shield in order to be programmed

BLEduino: Bluetooth 4.0 Made Easy  has a USB port, which might make it less power efficient. Does not seem to be publically available to buy just yet.

Bluz: A cloud-connected, Bluetooth LE development kit by Ben Harris — Kickstarter

At least according to specs, this seems to be what I am looking for: LightBlue Bean – Punch Through Design. It says:

The Bean is the first Arduino-compatible microcontroller board that's wirelessly programmable over Bluetooth Low Energy.

It costs $30 though, so a bit more pricey that the options above. I had to get deep into Google's search results to find LightBlue Bean.

I wonder why the other ones cannot just be programmed on serial pins? Have I missed something?