It was about 2 minutes of interesting reveals, and about 54 minutes of filler.
I am not kidding about the filler. For example, he spent a few minutes talking about the mug he got when he was on the Colbert Report.
There were celebrity questions from:
Dom Monaghan
Billy Boyd
Evangeline Lilly
Orlando Bloom
Stephen Fry (no, not a question, just a really cheesy running joke where they would cut back to him every 10 minutes or so and he was still talking)
Lee Pace
Luke Evans
Stephen Colbert
And then a few questions from fans. Most of the questions had little to do with plot points, and where they did, Peter was very stingy with info.
I guess we found out that Peter acknowledges that woodland elves are a lesser brand of elves than the Sindaran. And he showed some concept art that has Thranduil's halls as a subterranean cavern with lighting breaking in through cracks in the ceiling and bridges fashioned from giant tree roots.
We saw a lot of green screen action. Tauriel will fight orcs at some point. One will get captured, and she'll threaten to kill it before being admonished to stop.
You see Thorin and co. arrive at Laketown and announce their entrance (again, on a green-screen set).
Looks like Legolas' physics-stretching fight scene in this one involves each leg balancing on moving beams as he fights, but they were green screened so who knows what those items are supposed to be (horses? giant spider legs? both sides of a convulsing ground as a crack opens up? some sort of industrial device? can't say).
The scene shown was Gandalf entering the High Fells tombs of the Nazgul. It's a spiral staircase around the edges of a deep hole, with each level housing a tomb of the nine. They're all busted out -- out being a key phrase, as he says they've been broken from the inside. As has been noted elsewhere, Radagast shows up and it really feels like this was the original introduction to that character that is now being repurposed without any attempt to address the awkwardness of it all.
Nothing on Beorn or Smaug. They showed some dragon stuff early, but it's clear it wasn't Smaug.
We saw the dragon hoard, and Bilbo apparently fell into it above his head like a little kid in a ball pit. We see him climbing out of it and shaking himself off. So much for sneaking around, I guess.
There was a greenscreen scene where Thranduil is talking with Legolas, but I couldn't make out any dialogue.
That's about it.