Beginning with Wreck-it-Ralph and Vanellope, character meet and greets are expected to be coming to the Imagination Pavilion in the Image Works post show area.
Disney described the Wreck-it-Ralph meet and greet as follows:
A new experiment will soon be underway at the Imagination Institute, creating a portal into other dimensions. This winter, that portal opens a window on the internet for Ralph and Venellope to step through for regular encounters with Epcot guests in the ImageWorks area of the Imagination! pavilion.
Disney has not confirmed that any other meet and greets are coming to the pavilion other than Wreck It Ralph
February 13, 2019: The Wreck it Ralph and Vanellope Meet and Greet officially relocated to the Imagination Pavilion as part of the Image Works.
December 17, 2018: WDWNT.com is reporting that construction walls are up in the Image Works area of the Imagination Pavilion in anticipation of meet and greets moving into this location. The article states that the Innoventions Meet and Greets including Wreck-It Ralph and Inside Out are expected to move to this location in preparation of the Innoventions buildings being removed as part of the Future World overhaul.
October 29, 2018: The Disney Parks Blog confirmed that Wreck-it-Ralph and Vanellope will appear at Innoventions West beginning November 21, 2018.
Additionally, the characters from Wreck-It-Ralph will be featured in a new “experiment” in the Image Works at the Imagination Pavilion.
ImageWorks – The ‘What If?’ Labs