Single post in Mass-Click Weekend 29
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Based on the System in work my best guess for the Inspiration of Jolteon's Mega was Raikou.
Spoilerish
This particular trio of Eeveelutions seems to be following the theory from the Story told by Eusine, a researcher of the Legendary Beasts, that the three pokemon that perished in a fire that were revived back into being as Raikou, Entei and Suicune.
The theory being that it was a Flareon, Jolteon and Vaporeon that passed away. :3
Spoiler Theory
Mega Flareon looks a lot like a Fluffy Entei without the adornments and I'm pretty sure that Jolteon is a Raikou. 
So I theorize that we're likely to see a Vaporeon Mega in the future that looks a lot like a Suicune.
So I theorize that we're likely to see a Vaporeon Mega in the future that looks a lot like a Suicune.