I might have a different take than most but here are my 2 cents.
First, you can basically create your own enhanced edition by following the modding recommendations in the BG Forums here on GOG.
Secondly, I personally would not buy the Enhanced Edition until it was a) $10.00, b) DRM Free, and c) available on GOG.
Third, I am going to guess it will not be possible to bring in any game save into the Enhanced Edition.
Post edited November 28, 2012 by Lou