I noticed that too! I got a 152 Evo but when I hold it, it feels much bigger. I laid it next to a 152 Flow Era (2011) and it seems like a much bigger board. I didn't lay them side by side so I'm not sure if the measurements are accurate on both, Maybe I will.
I think the blunted edges produces bigger "shoulders" so to speak, with the effective edge brought up.
Since I want to retain all mountain capabilities on the Evo I am really excited about this, we'll see when we get some damn snow