I got to play the demo, and it was a ton of fun. Some things I learned and liked: while combat was pausible real time as stated, it moved more slowly than other games, and felt like there was enough time to actually line up attacks and give orders, instead of pause, give all orders, unpause and try to follow all that happened at once.
Tripping is in, power attack as a setting is in, channelling and spontaneous healing is in. Fighting defensively is in. Super detailed character screens with lots of information. There are feats from many books beyond core. The wizard default character I had had both evocation spell focus and elemental spell focus.
There was some cool example kingdom events, which definitely expanded the story of the campaign, and some of the encounters showed one way they'll be expanding the adventuring storyline in a pretty smart way.
One of the developers also mentioned that a) everyone on the team is playing the tabletop campaign (with 4 different games to accommodate them all), and b) they've talked with all of the Paizo staff who worked on the AP, and have gotten contact information to reach out to the freelancers who worked on it as well.
They also mentioned that they're planning on doing a capstone adventure to take place after the end of the AP (and presumably taking characters up to 20th level, which they separately stated was their plan.)
I asked about mass combat, and they said it would be included as one of the kickstarter stretch goals in some form, but probably not as in depth as the Ultimate Campaign rules. Also, that for that section of the AP they'd add in more content for the PCs to do in adventuring mode like missions behind enemy lines, etc.
There's probably more, if I remember anything else I'll post here.
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