I got hands on with the new SmallHD 503 today at BVE. Should be relevant here. There's a 703 version and a 702 oled coming out at the same sort of time but they weren't at the show today.
Felt solid, all metal frame with gorilla glass over the screen
Buttons felt solid, thumb knob is greatly improved over the 502 and 702. Doesn't feel like it's about to break every time you touch it.
2200 nits claimed, certainly was pretty bright. It has a studio brightness mode which locks it at 100nits.
For me, this is a great monitor for on camera needs and as a quick reference for the DOP as it has exposure tools and LUTS (just like the 502). Not sure I would use it as a focus monitor alone on a stand with sun shade though, leave that to the 703 and slightly larger monitors.
It's bigger and heavier than the 502 but then it's full metal and has a big heat sink on the back. Power seems to be external only at the moment but theres some sort of connection on the back. After market battery plate connection maybe?
Google Drive album