Yeah, there's been a couple of conversion attempts. Since IWD2 is the only IE game to use the 3E ruleset it makes it very attractive, or unattractive, as a conversion target.
Weimer tried getting BG2 into the IWD engine to make it a 3e game
Icewind Gate, forever at an open beta). You're probably thinking of
IWD1 Tutu, which sought to bring the 2e IWD content into the IWD2 3e engine but has never seen a release.
And just to round out the conversions, DavidW and I have a beta of
IWD-in-BG2; which seeks to move the IWD content into the more modern BG2 engine to allow for goodies like dual-classing, NPCs, kits, etc.
edit: is it really that hard to have a preview, GOG?