Switching to a next-gen console means starting with a clean slate, even with the games you were already playing.
Sony, Microsoft and other publishers have announced that they will cut players a deal on re-purchasing Xbox 360 and/or PS3 games when they upgrade to their next-gen counterparts. Players who buy any of this season's cross-gen games like Call of Duty: Ghosts, Assassin's Creed IV: Black Flag, or Watch Dogs on current-gen consoles can get the games on PS4 or Xbox One for a comparatively low fee. ($10 seems to be the going rate.) That sounds like a good deal for die-hard fans who won't want to wait to get their hands on the high-profile games they've been waiting for, especially if a day-one console purchase isn't in their future, but there is a catch: Players who "upgrade" from one console to the next will not be able to continue from where they left off on their PS3/Xbox 360 games.
EA and Activision both confirmed to Kotaku that single-player data for their cross-gen games, including Call of Duty: Ghosts and Battlefield 4, will not transfer from one console to another. On the bright side, EA and Activision did say that players' multiplayer progress in those games would carry over from one platform to the other.
Ubisoft sang a similar tune regarding Assassin's Creed IV: Black Flag: Campaign save data will from current-gen versions will not be compatible with the Xbox One or PS4 versions. Ubisoft did not confirm whether Watch Dogs, a title that won't be available before the PS4 launches, would face similar restrictions. Ubisoft did not confirm whether ACIV's multiplayer progression would be transferrable.
Though disappointing, the news should not come as a surprise. There is no substantial precedent set for cross-generation save data transfers, especially considering that neither Xbox One or PS4 will be backwards compatible.