There are some interesting bits in the teaser, yes everyone got the bb8 but there is more (it's speculation obviously) but I am trained for Falcon bits and pieces ;)
Top right corner: maybe the new cockpit piece?
Close to bb8 on the left, the brickbuild circular part: I`m betting this is one of the six exhaust vents on the back of the Falcon, why? Because I`ve tried several designs for my Falcon MOC and this build with the new quarter round tiles (tile, round 27507) could allow a more detailed solution, at a slightly bigger scale.
The old "dish element with openings" close to bb8 on the right, will be used for the top window of the turret (similar to the old UCS Falcon)
This ladies and gentlemen is the base construction/core of the cockpit, there are computer panels on the back wall of the cockpit visible (tile decorated 3069bps1). They are using a similar technique as used for the Saturn 5 set for the cylindrical part of the cockpit, rounded slopes are visible in the right corner and flying on the left side, ready to connect. The new canopy pieces will perfectly fit to the studs pointing forward.
In the last frame, there is the docking ring visible in the lower center of the frame (quite a similar build as used in my model)
This is really exciting guys! I`m sure we will get a big improvement over the old design.