Assassin's Creed: Ezio Collection looks like it's a real thing, the PS4 and Xbox One package being revealed on the Korean Ratings Board (via NeoGAF) - often a source for outing previously unannounced titles.
Ubisoft took a break from its annual Assassin's Creed release schedule this year, choosing to focus on getting its 2017 entry just right after a middling reaction to 2015's Assassin's Creed: Syndicate. We have had the Assassin's Creed Chronicles games, India and Russia, but they were pretty underwhelming 2D takes on the franchise. In December the Assassin's Creed movie, starring Michael Fassbender, is released.
While a remaster of Assassin's Creed 2, Brotherhood, and Revelations might not excite everyone, the Ezio games are highly regarded amongst series fans. A re-release with graphical enhancements would likely go down well.
Ubisoft stated it does not comment on rumour or speculation when asked about the Ezio Collection leak.