not really recent, but check out the presentation links at the bottom of the this siteThe old Lee pool complex on the Esplanade near MGH was torn down in June. The state "contracted Maryanne Thompson Architects to design what is being called the Esplanade Riverfront Pavilion, a multipurpose recreation center with indoor and outdoor space for athletic and cultural events. The building would also include space for organizations like the Esplanade Association and Hill House. " Boston Guardian
The state wants to build it with private funds and have it connect with the park projects near the state police station next door. I thought I saw a plan once but I can't find anything recent
Esplanade Riverfront Pavilion Planning Project
A plan to make the Lee Pool a multi-purpose pavilion
www.mass.gov