So true. There is a gap in the product line. If you follow the history of the Programmable option you may notice that it follows the introduction of new versions of the hardware. I feel that it is only a matter of time before we see the whole family of XBee’s supported by a programmable option. The new XB900HP and XB868LP were introduced with a programmable option! So as that famous line in the Hobbit goes the answer is—Time.