If I'm not mistaken, it looks like Banq, the upscale French/Indian fusion place in the Penny Savings Bank (next to Union) has been doing mock service the past couple of nights; I"m guessing their opening is imminent. Very cool-looking interior design.
Haven't figured out where Estragon is going in: perhaps the space on the Washington St side of Harrison Ave near Rocca that was originally slated to be the Franklin Cafe II? It's billed as a "1930s-style tapas bar with a 17-seat bar, a salon-style lounge, and communal tables". Intriguing. Spring opening target, so expect summer.