The REAL teaser is the datamined codenames in the PC beta. For reference, the MKX one had "Paul" (Alien), "Bar Fight" (Bo Rai Cho), "Mechanic" (Triborg), and "Lambs" (Leatherface).
Scooby & Shaggy (files split up under two names)
Alma
Talion
Celebrimbor
Two of those are Hellboy and The Atom. The Atom is almost certainly "Scooby" & "Shaggy" because, in a baffling turn of events, '
Scooby-Doo Meets The Atom' is an upcoming DC comic.
The other three are references to Monolith Productions games.
"
Alma", the demonic woman with long black hair from F.E.A.R., is almost certainly the
Enchantress.
Talion and
Celebrimbor are the dual protagonists of Shadow of Mordor, who share a body. Talion is a human warrior and Celebrimbor is an elf ghost.
These two I'm pretty baffled on. Normally I'd say Etrigan or Deadman would make sense because of the shared body theme, but one of those names (probably Talion?) is Hellboy.
Speculate away on what Celebrimbor might be a clue to.