And Lo! For it has come to pass!
The spinoff to Despicable Me releasing this summer will indeed have Yetis...
Minions (coming 7/10/15 in US) has a sequence with the Minions being minions to a tribe of Yetis in Antarctica. Things don't go well and they're forced to leave their abominable masters.
Here's hoping they make toys of these yetis. Santa, you listening?