I would have loved to tell you had bay12 not derped out on me. Now that it's back I've forgotten what it was I wished to say. The issue is I don't know how much you guys already know and how much of this is just repeating what you already know. Might as well just say a bunch of stuff in hopes of covering it all.
Intake ports work now, and radial intake ports have been added for jet engines. Kerbinless command pods (in 2 varieties from what I can tell) are in so you may create probes, they will require electrical energy and once the batteries run out the command pod will not respond to control input. Multiple command pods per vessel, however the first one placed will be the 'root' one and full of kerbonauts, the rest empty. Ion engines that use batteries and xenon fuel, the engines are far more powerful than they would be in reality for gameplay/fun purposes.
Resources (fuel, electrical energy, modded resources) can be transferred between ships through docking ports, or shut off for whatever reason. Action groups set to the number keys can perform user-set actions per vehicle, so you can create a ship that toggles an upper stage's engines with the press of the 1 key, or an emergency shutdown that toggles engines off and boosts the command pod away from the rest of the ship, for example. Flight planning, but I think we've already seen it. Multiple flight plans within flight plans to coordinate each part of your flight.
The game has also been reported to have a 'vast improvement' in terms of how well it runs. The mod that slows time during heavy physics calculations is also in natively, in the form of a slider. If you want the game to always run the same speed but cut out frames everywhere then turn it down, but if you want to see every detail of your ship exploding turn it up. Also useful for piloting complex crafts that physics calulations would otherwise make it impossible to fly due to framerate issues.
Also, I don't know if any of those pictures showed, but there are now girder-type structures you can place, useful for lightweight probe construction or just for structure in general.