That's a bit tricky.
On march 2015, at PAX, the dev-team said that doing the three jobs for Heavensward was very difficult and they don't want to do the same. But, like I said earlier, they had the task of designing those three jobs while creating Ninja for 2.4. So, we can assume that they won't design four jobs at the same time, which can realistically be the reason why Yoshi-P officialy stated, at the launch of Heavensward, that they won't create another job mid-expansion.
So, two jobs is a possibility, but there was no official statement to confrm that, unless you consider the NA fanfest tweet, that was mysteriously updated to remove the number...