Today at SDCC, guests were treated to a Gravity Falls panel, as well as an autograph session. Shortly after he got through the autograph line, Instagram member kevinsidethegrid posted this photo.
As you can see on the right of the picture, it looks like we have our first look at the Gravity Falls skydome and terrain discs for Disney Infinity Disney Originals (2.0 Edition). This would explain having seen the Gravity Falls skydome and terrain being used in the Toy Box previously during events, and coincides with Alex Hirsch, creator of the series, stating that there will not be figures for Disney Infinity during the panel.
Stick around the rest of the weekend as we find out more Disney Infinity information from SDCC.