The official TF2 blog has tantalisingly brief word
of updates coming to the Pyro class this week:
We're going to ship an update with another small set of Pyro changes this week. Like our previous update, our goal is to increase the degree to which skill can make a difference between two Pyro players. We received a bunch of useful feedback after the last update, and we think we've managed to address most of it, without removing the skill-based additions. As always, play with it for a bit, and then let us know what you think.