As you probably know the TF2 Robot Boogaloo update used the new beta import system. Currently it only supports hats and misc items, but Valve just posted something on their blog mentioning that you guys might want to submit things this week as there might be an imminent update.

I went ahead and recompiled an old hat as an example: http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=385

Happy Modeling!