TobAlso you assume a heavy update is actually planned but Valve said long ago only 1 class would be updated. Any rumor of a heavy update ever since has been made up by community members
Well actually https://www.teamfortress.com/post.php?id=22675
But! Okay, both of them might get new Class Updates at some point. In fact, it's highly likely they both will.
But! Only one of them will get it first. Click here to find out how to make your vote count in the biggest election of the year, the epic showdown of The Maestro of Maim versus the The Thrower of Flame! Heavy versus Pyro!
The phrasing in the update page was more likely along the lines of "only one class will be the focus of the next update", not that they would not produce an Heavy update.