As for watch dogs. Its connected to Assassin's Creed Series. The game was delayed because of bad reviews that they were going to get and the game has been down graded a lot from the original vision of the game. Then again Ubisoft's Assassin's Creed games are basically bunch side missions. Also Watch Dogs is Assassin's Creed in modern day setting. Hopefully the delay will allow them to get back on track to the original vision that they had for the game.
I've always assumed it
used to be part of the modern-day setting inside or part of an AC title (ACIII?), then some producer got dollar signs in his eyes and it was split-off from whatever game it was supposed to be part of into a whole new game entirely because; Money.
Everything I saw looked ridiculously ambitious though, not really surprised they've had problems getting it all to click. I wouldn't say the AC series are just "a bunch of side missions" because narratively the first 3 games (AC, ACII and AC:Brotherhood) is some absolutely incredible storytelling. They started to lose their way around "Revelations" not being all that "Revelatory" as by then the main writer had left the franchise and it had melted down into basically a money-printing machine by the time ACIII rolled around and shit the bed, creatively and story-telling it was a wet-fart end to a series that demanded more.
With ACVI they've pulled back to a "less is more" storyline-wise and filled it full of side-missions and fancy bells and whistles, but it's less "Assassin" now and more gimmickry than ever before.
I'm almost glad they're not touching Prince of Persia because those early games, especially Sands of Time, are replayable to this day and we'll always have those games. Like AC, ACII and ACB & R I've played each of those games right the way through more than twice each, such fulfilling stories and that's, at the heart, what the Prince of Persia games were about too...