Well, the chipset supports 802.15.4 in hardware, but for maximum range we are doing narrowband RF with frequency hopping, which isn't compatible with 802.15.4. You can get a couple hundred meters with Flutter in 802.15.4 mode and the chipset can switch on the fly, so it could be possible to do both.
I'd also love to see Flutter interface with the $15 GE Wink LED bulbs, since the factory hub is awful. Those are Zigbee or Z-wave (which I think is Zigbee? forgetting...).
Also... Flutter can probably read smart meters... So yeah, lots of potential here.