According to VideoGamer.com, Tales of Monkey Island has exceeded Telltale's expectations and become their strongest performing title yet.
Dan Connors on phone:
“Unfortunately I can’t get into the specific numbers, [...] but I would definitely say it’s our strongest performing franchise to date. We’re pretty excited. It was number one on Steam for a few days. It did really well. It’s been our best performing title from our side as well.”
Source: VideoGamer.com