UPDATE: PoP Forgotten Sands now works in offline mode on steam properly
Although the new UPlay launcher WILL load into offline mode, when you launch Prince of Persia: The Forgotten Sands, it will NOT let you play the game offline. This is the only thing you see when the game launches: "Attempting to restore network connection. The game will resume once the connection has been re-established."
You cannot circumvent it with a disabled network. You cannot get around it either by putting the Uplay launcher into offline mode. Even though the Uplay launcher starts in offline mode correctly, the game will NOT play in offline mode.
I have already activated the game the first time in online mode. I am able to play IF the Uplay launcher is in ONline mode only (I login with my info and everything). Oddly, Assassin's Creed Brotherhood still works offline with the same Uplay launcher, just NOT Prince of Persia Forgotten Sands. My guess is it's a problem with the new Uplay launcher. It does technically launch Prince of Persia Forgotten Sands a second time, and it's this second launch from Uplay that's not correctly going into offline mode for Prince of Persia Forgotten Sands