Warning, there are story spoilers abound in this link! You have been notified, proceed at your own risk.
Portal 2 Info and Spoilers
edit: is it just me, or does Cave Johnson look a lot like Ronald Reagan?
holy shit

Time rewinding, gravity manipulating, wall walking and stuff like that are already in some games.
Hen7 wrote:
I wonder what new gameplay elements they will add except of portals, because I'm sure they will.
Time rewinding, gravity manipulating, wall walking and stuff like that are already in some games.
Honestly I hope they don't add anything like that...just more story and unique puzzles. Portal is amazing because of its simplistic design yet unique application. I honestly could not have seen Portal be so big if they incorporated gravity/time manipulation.
and chell as an NPC
Or maybe it won't...
Ricotez wrote:
I didn't read very far as well. Though interesting that C. Johnson is gonna play a role. You remember the easter egg?
oh yeah I forgot about that. my friend who has vave contacts (working on episode 3 not portal or TF2 unfortunatly) tipped me off the other day, there isn't much more information coming from him though, he's a pretty good employee....lets out no secrets 
taco wrote:
I just hope they support the game port-retail (new official challenges) and that there are more challenging maps in the retail project - I don't want to spend the first 12 chambers learning how to use portals.
well. if the first 12 or whatever chambers are about using portals ill play it 1 time and skip it all the next time ill play the game . thats sad cause its gonna be so awesome 