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Cheaper that the existing model? New features? Who knows?!
Check out these FCC labeling/testing reports:
Also here: https://fccid.io/WR9EBSTAT3LT01
Looks like it'll do 802.11 b/g/n for wifi and FHSS in the 900+MHz range (which I assume is for remote sensors). Still relies on 24vac power, so not battery operated.
Maybe this is a rebranding (and hardware redesign using cheaper parts, like "slim" video game consoles) of the current Ecobee3 in preparation for a new model with more capability...?