We'd seen the Joker plenty - HT just did a horrible job
And about the plot, we know the same basic stuff as we know about TDKR IMO including the entire opening for TDK just as we've seen for TDKR.
For me the trailers for TDKR have thrown up more questions than answers - most importantly about the timescale of things, Bruce looks really old and weak at some points. And we know he's retired for a while, we know he comes back as Batman, we know Bane imprisons him, we know he escapes, but we don't know what happens to him at the end, and we really don't know how all the above pieces fit together in terms of the order of events
We don't know Bane's origin, we don't know who his army is, we don't know what role Ra's has, we don't know what role Talia has, we don't know if other villains make cameos or not, we don't know much at all about Catwoman except what we can guess at. We don't know much about John Blake. We don't know who all get hurt or killed by Bane.
I could go on...
You've done well then to avoid the spoilers. I can answer all those questions up there, including who Blake is.
Anyway, I certainly hope there's more to this movie than what's been shown so far -- and we're still 3-4 weeks out -- but I have a feeling we all know more than we realize. Except how it all ends. But I can guess that too.