Telltale Games is making a new Monkey Island series of games:
http://www.telltalegames.com/monkeyisland
Sadly, it doesn't look like they've hired Ron Gilbert to make his original MI3. Oh well, I can hope for the future.
Also, Monkey Island 1 Special Edition for XBLA, with New and Improved graphics:
http://www.lucasarts.com/games/monkeyisland/