I tried using the Regroove but did not notice any real difference in the swing of the drums I tested it on. But I am sure I will experiment with it more since it seems like an easy way to cheat and get variations in your arrangements of everything. Not just your drums.
I was excited to learn about LANES. That seems like it is going to be extremely useful.
Assigning names and colors is going to be a blast as well. One of my favorite things about Reason is it's visual treatment. I like the way it looks.
Arranging songs using Blocks seems really cool too.