We all know the story of when Chell awoke and defeated GlaDOS, but what about the story behind Aperture Science? This fan made sequel to Portal 2 tells the story of a new test subject in the 1950's and how they changed Aperture forever.
When visiting the old Aperture facilities in Portal 2, you would have to use the Portal gun to manoeuvre around the areas. As part of Portal 3 Origins is set in the 1950's, the building's will be new and not derelict.
Other than remakes of portal maps, do you have anything else?
Yes, there will be all new tutorial chambers, and other test shafts as well. I don't want to say too much about it as I want it to be a unique experience and surprise when playing it :)