Yes, I heard this too. I wonder what can be done (additionally) with the touch screen.
Here's Kartus statement from the dev thread:
"Regarding 600 model, port of "Browse Folders" feature is planned in foreseeable future.
I'll work on it after releasing "localized" version of PRS+ for 505. It's much harder than 505, as you can't do mistakes, but still doable."