Team Fortress 2 has been out for over two years, and in that time developed a reputation for a steady stream of free, post-launch content. Now the Engineer class is the only one remaining for a big update, but Valve assures that won't be where the flow of new goodies ends. A Community Fortress interview with Valve's Robin Walker confirms that there are other updates in the works, for both before and after the final class update. "We've got multiple updates in the works still, at least one of which will land before the Engineer pack," said Walker. "As always, we haven't planned too much out beyond that point, because we want to see what feedback we get from the community."
This doesn't give much insight to when the Engie update might come, or what to expect from other updates. But Valve has continuously surprised with new additions like the Hats, so even without class-specific patches we're sure to see some interesting new additions coming. Walker also mentions that the War update was created because the team thought that the Spy & Sniper combo update made fans unlikely to appreciate a single class update. Now that the Engineer is the only one left, we have to wonder what Valve will do to spice it up. The interview reaches into the minutiae of competitive Team Fortress 2 play, so give it a read if you want all the technical details.
source
This doesn't give much insight to when the Engie update might come, or what to expect from other updates. But Valve has continuously surprised with new additions like the Hats, so even without class-specific patches we're sure to see some interesting new additions coming. Walker also mentions that the War update was created because the team thought that the Spy & Sniper combo update made fans unlikely to appreciate a single class update. Now that the Engineer is the only one left, we have to wonder what Valve will do to spice it up. The interview reaches into the minutiae of competitive Team Fortress 2 play, so give it a read if you want all the technical details.
source