Well I've been doing my own cracking, I can tell you there is a lot of info not posted here, but I need to organize it all before I post it here (have been posting it elsewhere though).
One thing is that the demo includes a not 'complete', but still pretty extensive version of the game's credits. Something notable:
LEON S. KENNEDY JASON FAUNT
CHRIS REDFIELD (No one is listed here.)
JAKE MULLER TROY BAKER
ADA WONG MICHELLE LEE
HELENA HARPER KATHERINE RANDOLPH
PIERS NIVANS KEVIN DORMAN
SHERRY BIRKIN SARA FLETCHER
DEREK C. SIMMONS ADAM CLARK
INGRID HUNNIGAN SERGIA LOUISE ANDERSON
PRESIDENT ADAM BENFORD RICHARD EPCAR
FINN MACAULEY JOSEPH ANDERSON
DEBORAH HARPER LAUREN KIM (MOTION CAPTURE) SAMANTHA JO (VIDEO STORYBOARD)
-FACIAL CAPTURE ADR (CAST)- KATE HIGGINS YURI LAWENTHAL MICHAEL DONOVAN SALLI SAFFIOTI DAVID LODGE EDEN RIEGEL CHRIS EMERSON LAURA BAILEY COURTENAY TAYLOR ROGER CRAIG SMITH MATTHEW MERCER
I've got the 'unofficial' names of some enemies (some are more obvious what they are as others), all sorts of gameplay moments in the story (they name off a lot of events in the file), and a lot of other details all around and I'm only half-way done with the demo files.
One thing I can say that was touched on is that the multiplayer mode with Ustanak is 8-players.