I didn't know Jobs well, but I did have a number of direct conversations with him, sat in on meetings at NeXT with him, spent five years developing software for NeXTstep, and had many talks with people who worked closely him (again, mostly at NeXT); our last conversation was him calling me up to yell at me for an op-ed piece of mine in BYTE (Nov 94) called "Whither Nextstep?"
With that tee-up, I'll say that Fassbender's portrayal of Jobs in this trailer pretty much falls flat. Fassbender looks too professional and lacks that burning gaze that Jobs used to such great effect, even while using up the people around him. Frankly, Fassbender comes across more like John Scully trying to act like Steve Jobs than like Jobs himself. Also, it took me a bit to realize that Seth Rogan was supposed to be playing Woz; again, the wrong vibes and aura. Frankly, I think that Jack Black with a beard would have been a better choice for Woz.