It appears there's some doubt as to whether Fido (and Rogers) actually have the technical means to support the eSIM. On May 2017 someone on the Fido support forums tried to activate a Samsung Gear S2 3g with eSIM and was told that Fido doesn't support the eSIM at all:
http://forums.fido.ca/t5/forums/forumto ... d-id/33162
If it's a matter of upgrading their infrastructure to support eSIM, that's going to take many months or else Rogers would've done what Telus did and commit to saying "coming later this year". By not saying anything at all that means it's probably going to be at least the second half of 2018 if not Apple Watch series 4 before Rogers support shows up.