As Chris also spotted, the screenshot accompanying the latest Scout update preview seems to show a game mode with a cart for each team, racing up a hill. Presumably the mechanics are the same: the more people near your cart the faster it moves, but it stops if an enemy’s in range. So your team is split between pushing their cart, shooting the enemies pushing their cart, and running over there to block the enemy cart entirely.
I like the sound of that. When the carts are close, there’ll be heavy crossfire and cart-blocking. Then when one gets ahead, both move faster as they’re less hindered by the enemy team. At that point, crossfighting is in the losing team’s interests because they can get back to their cart sooner after respawning. If it works that way, it could be really interesting. You have to wonder how big a part Sentries play in a mode like that, though.
As for the new items – the Sandman stunning ball, and the Bonk! bullet-dodging energy drink – there seems to be even more whining than usual about imbalances. I’m not as sceptical, they sound great. I was disappointed with the Heavy items not because one involved slowdown, but because I just didn’t particularly want two of them. Both the Scout ones so far are highly desirable, and it seems absurd to fret about their effectiveness when we’ve been told no specifics.