Shure's CIEM version is already here (as a removable custom sleeve option) - the Sensaphonics Custom Sleeves (SCS) are custom fitted to your ears and works with 99% of the current and past Shure models.
I am looking forward to demoing the Sony CIEM (universal demo version) at a California Head-Fi meet in the future (crossing fingers) as it would be great if the U.S. market could have a listen and decide for themselves if the CIEM will be on their next purchase short list.
Haven't seen Sony at a Head Fi meet. Closest you'll get is at THE Newport Show next year. Not seeing the hype though. Not like any have enough options for CIEM's nowadays. I guess people like their particular hypebeasts.