I am waiting for the same thing. I have an heirloom chandelier in my daughter’s room that I tried using the E12 -> A19 converter with it didn’t work because it made them extend too far to fit. I also tried the LOHAS E12 Candelabra bulbs which work exactly like the LIFX A19s except for the fact that their APP is REALLY BAD and there is no way to control the kelvin values to adjust the warmth of the lights.
I really really hope they release an E12 option soon. Every light except my E12 and Mini GU10 fixtures are LIFX now. Alexa has been working very hard in my household