The initial hope was to upgrade the blue series 2-1 to Matter. This will require a special cable vs OTA updated. @Eric_Inovelli is recommending waiting until the blue series is upgraded to the MG24 or the Jonagold is released.
Regarding Thread and upgradeability, if you’re wanting Thread, as much as I hate to admit it, I think you should wait until we put the MG24 chip in the switch. I mentioned it in more detail above (I’m sure it’s buried by now) but essentially, the chip we have in the 1st iteration is the MG21 and, while it can be upgraded, it will require a burner wire that plugs into the serial port on the switch as it does not support OTA updates (cross-protocol – ie: it will allow OTA ZigBee to ZigBee, but if you go ZigBee to Thread or ZigBee to Matter, it will require the hardwire update). Whereas the MG24 will allow OTA cross-protocol.
We are going back and forth and ultimately I’m waiting for some things to settle internally from an organizational standpoint (should have everything figured out mid-March) but I’m pushing for a separate line that specifically markets to HomeKit (Thread 2-1 Switch (On/Off & Dimmer) | Project Jonagold (White Series) ) that I’d like to get off the ground. It seems like a no-brainer to just create the firmware and make a limited batch to test the waters.
TLDR: The Blue Series initial launch will require a ZigBee bridge to work with HomeKit and the first iteration will require a physical cable to update to Thread (whereas V2 will allow OTA updates). I’m pushing for a separate series that targets HomeKit, but I need the resources to do so – however, in the coming weeks, there should be a big announcement that should free me up to focus more on innovation, which may include HomeKit (knock on wood).