A 43-minute video leak of the beginning of Syndicate has leaked online. No, I'm not providing the link. SPOILERS ahead...
This game picks up pretty much where Unity left off. You're one of the Initiates, operating through Abstergo's Helix video game machines, and still taking orders from 'Bishop.' Your assignment is to locate a Piece of Eden known to exist in Victorian London via the genetic memories of Jacob and Evie Frye. Once you pinpoint its' location, Shaun Hastings and Rebecca Crane (in the present day) will swoop in and take it if it's still there. The Templars are hot on the trail of this POE too, so it's a race to the finish line.
Other points:
- Abstergo/Templars control most of the world. There are Assassin enclaves in France, Brazil, mid-Atlantic (The Altair II, commanded by Gavin Banks and William Miles), Nigeria and Japan.
- Isabelle Ardant is the current Templar Grand Master in London.
1868 London. The Templars rule supreme, under the command of a new ultra-evil Grand Master named Crawford Starrick. (His collar shows the first historical appearance of the Abstergo logo.) And he's eyeing the throne of Queen Victoria herself - and beyond that, the entire world. Only "the unstoppable Frye Twins" stand in his way...
EDIT: Holy shit. This 40 gb game is reportedly going to require an 18 GB DAY ONE PATCH before you can even play it the first time. WTF?!?
And you are surprised why exactly?

Fortunately i have been cured of pre-ordering and first day play for most franchises, especially the big ones from EA as they are never ready to play.
Give em a month or two and then read up about first hand experiences and only then decide to try it.