Rumors in Canada were about Allison heading back to Britain.
Apparently, his wife died suddenly last year (i sure don't recall hearing about that one) and he wants to go back to take care of the children.
He has been linked with Renault again.

What do you guys think about him leaving Ferrari, just when the car is starting to do great things? What will it mean for the Scuderia. How will it affect the 2017 car?

It's currently only a rumor, yet it's highly plausible, given the circumstances....