It could be a new Baldurs Gate entirely, or maybe just a re-release for iOS or something, but at this point who knows. Whatever it is, it's coming from Beamdog, a developer headed by Trent Oster, former designer on Baldur's Gate.
At first, I thought maybe it could just be a tease for a new game just using a version of the infinity engine or something, but this is a quote hidden in the sourcecode for the website:
"Pore over the tapestries and works of art hanging from our walls if you wish, Child of Bhaal... perhaps you will find a clue. But patience, ah... patience would reveal it all."
So what do you guys think? Excited about the possibilities? Personally at this point I'm very skeptical, so I'm not holding my breath, but I guess we'll see what happens.
Edit: I am aware my grammar svcks.