It's always important to note when you're right. If you've read our Pyro coverage carefully, you'll notice that we, along with the rest of the internet, believed that Team Fortress 2's Pyro is a girl. And she is. It's almost confirmed.
Robin Walker had a chat with CS-Nation, in which he said,
"We've never been terribly happy with the Pyro, in particular with her shallower skill curve than other combat classes. We really want highly skilled Pyros to be visibly more effective than the average Pyro, and the new features are designed to address that."
Handsome reader Rich Powers tipped us off to this, and threw in this other quote from the interview:
"We've been playtesting an upgradeable teleporter, where the level affects the recharge time. It's working out well, so it's likely that you'll see something like it in the Engineer pack."
Which would seem a pretty strong indication that the Engineer will be next for an upgrade.