stuff you can generally do already. I don't think RAM is much of an issue for the nexus 7, I doubt anyone even fills the RAM near capacity. Main reason they added extra RAM was gaming, since it's shared system memory, a game taking up 500mb+ of video memory space, really eats into available RAM if you only have 1GB. A game will use both memory for videocard, and memory for the game executable. so gaming memory usage is not just limited to video memory. you're going to run into cpu/gpu bottlenecks before you run into a memory bottleneck.
most apps are just a couple MB's, you could have hundreds of these running at once and have plenty of memory left over. these improvements are largely going to be unnoticeable. I wouldn't consider a transparent app drawer a significant improvement, since it still takes up space. apps like video players and browsers can be fullscreened to hide the navigation and notification bars.