StickSkills.com writes, "Last year, we saw the release of Playstation All-Stars Battle Royale. The medley of Playstation characters featured in the title brought back a bit of nostalgia for fans, but didn’t quite nearly make the splash Sony may have wanted. It’s quite possible that Ubisoft’s Assassin’s Creed Duel never made it as an official title for fear of a similar fate."
that's because they're too busy dishing out a series every year.
I don't see why anyone would be worried about suffering the same fate as All-Stars. The title sold poorly because the marketing for it was awful. The "first" TV spot was really only conceptually linked (many characters aren't playable, way before the announcement, etc) and the second one didn't show any sort of gameplay. It pretty much just released and Sony thought it would instantly sell its self, which didn't happen.
Well that looked like an epic fail in the making.
This looked like it could have been fun!
Looks crappy.