hmm it reminds me of my Letcool N350JP which i loved as i have big hands and the buttons on that where nice.
i hope this has larger buttons then a standard 3ds for one. And yea the specs on this and the S601 and s5110 are all the same, not that thats a bad thing, hopefully like i said it will mean stuff for one will work on the others just as well, then the rest might be down to people choice in form factor.
the resolution for this is going to be better than the S601 which is almost laughably bad at 480x270 but I view the S601 as mainly a retro gaming handheld and you aren't going to notice pixelation playing your old 8/16/32 bit games
800x480 is a nice resolution for a handheld and a screen that size, should be good for playing movies and stuff as well as some more demanding android games (where dpi matters)
also the source code should be the same, I can't see JXD going too far away from a reference board they are familiar with and probably have chips still in stock. So most of the same procedures and modifications should be compatible with this that are already discovered for the S601.
kinda off topic, but I was really really not happy with my letcool. pressing multiple buttons actually visually slowed down gameplay and emulation, and for external pads only one keypress at a time... that was just ignorant for a Y splitter for 2 controls... I mean really? But it was fun to play around with lol