Hi,
From Freescale side, a SABRE board for the i.MX7 will be available, but it is not small enough for a smartwatch reference. Another option that seems to be more suitable could be the i.MX6SL reference design named WaRP, oriented to wearable devices, and includes EPD screen and BLE 4.0 support.
You could find the Fact Sheet on the following link:
https://www.freescale.com/files/32bit/doc/fact_sheet/WARPFS.pdf
Hope this will be useful for you.
Best regards!
/Carlos
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