A recent article in The Art Newspaper Russia describes the Tretyakov's grand transformation and details what it will look like in 2025. (English translation available here). 

AEA worked with the State Tretyakov Gallery, the world’s leading museum of Russian art, on a strategic master plan that will ensure world-class delivery in all aspects of its operations, including the strategies for collections and exhibitions; audience development; digital engagement; education and outreach; marketing and communications; financial performance; and the redevelopment of its multiple facilities in Central Moscow, including historic artists' houses.