Better wait for the RG-350 with full PS button layout (L1, L2, R1, R2) and form factor like the Nintendo Switch
Is something like that planned? :p
Yes, it's actively in development right now. No release date yet. Estimated price is around (or less than) $100 USD.
Known so far:
jz4770 CPU @1Ghz
3.5 inch screen at 320x240 resolution, 4:3 aspect ratio, 60hz refresh rate
full PSX button layout, with L2+R2 and dual analogs with L3+R3
USB Type-C connection
Volume through +/- buttons instead of a wheel
Low battery LED indicator
LCD won't be exposed to the elements
Horizontal form factor.
You can even see the firmware development: https://github.com/tonyjih/RG350_linux