The weapon that would let Scouts “ascend rapidly” has been revealed as the Force-A-Nature on the Team Fortress 2 Scout Update mini-site.
The Force-A-Nature is a double barreled shotgun that replaces the scattergun. It has the ability to knockback enemies that are fired upon and can send the Scout sailing when fired in the air.
From the description, the weapon holds only two shots before requiring a reload and will have a drastically reduced reload time compared to the scattergun.
Players can also vote for which unlock will be released first through a poll on the Force-A-Nature page.