Last night in a fun little bit of play I got the Razorback and Ambassador, the last two I was needing.
I still feel like it would have been more fun to earn these weapons through achievements (so long as the achievements are tied to useful tasks and based on skillful play). The problem is that you'd want all classes to be updated at once for this method so we wouldn't have a flood of one class. But that's not the best way to roll out the class updates, which need careful and focused play-testing.
At least I still get to do the achievements anyway. Working on them has turned the Scout from being a class I hated to one I rather enjoy and am getting good at.
I hope we get a double update again next time. I'll bet the Soldier's coming up really soon.