Alright I got mine and have worn around for a bit, not skated.
I'm a 10 in all NB I have ever worn minus the 272, which just suck for me.
It feels like a bit more form fitting, thinner dunk with a better midsole and better toebox. My normal size feels fine they have a tad bit of room but nothing sloppy. There's a bit of arch support but nothing like the 1010. The heel foam is already breaking in nice. I normally use my Superfeet insoles in 440 and these are thick enough I probably won't at least at first. They feel thicker than that combo. They have foam in the forefoot but I can't tell yet if it's thicker than what's in the 1010, but since the 440 and 508 don't have any there it's obviously going to be thicker.
I've been back and forth between 440 and 1010 for a while and recently skated the Asics Japan S. These feel like a better version of the Japan in terms of overall thickness, fit, and feel.