On September 14th, 2016, the Sum of All Thrills and Stromstruck exhibits inside Innoventions at Epcot will close.
Innoventions West exhibits were closed last year and some of the space was utilized for meet and greet areas for Baymax and Joy & Sadness. Colortopia, the newest Innoventions exhibit to open, will remain open at this time, but will close whenever the contract with Glidden concludes. Disney has stated they will make an announcement about the future of the Innoventions space at a later date.
All signs point to a massive overhaul of Future World at Epcot coming in the next few years, and those plans may include the demolition/repurposing of the Innoventions East and West buildings, thus why no replacement exhibits are being added.