SCPM: GOG is going to reveal something at E3 according to recent reports:
"The next few months will be very important for GOG.com, who is working on two development projects. Already at E3 in Los Angeles, the company will present a new technology that will allow it to expand service offer with new products, expand its functionality and attract new customers."
Machine translated from
https://www.cdprojekt.com/Press_Room/Aktualnosci,news_id,2231 Maybe a client, maybe some kind of emulator, we'll see. :)
My guess is an optional client, which is a good thing, but naturally I'd be more excited if it was specifically related to classics, like AMIGA emulation.
Although, if it were some sort of multiplayer software that allowed, say, the Homeworld games to appear (I know, I know, Gearbox might not like GOG), or other multiplayer classics, that would be super-sweet too.
I'll stay relatively pessimistic for now ("GOG is proud to announce you can now play SMITE and other MMOF2P titles on our service!") so I'll be overjoyed if it's actually related to classics. A freeware classic would be nice to celebrate, though.