I bet it is: the video I saw gave me the feeling of a civ5 dlc so it is likely that not much changed under the hood.Edit: Which after looking around the BE forums is disappointing because apparently BE is very similar to Civ5 under the hood.
But then, even if in the best case (I doubt so) I could produce a stripped down version of IGE in two hours, after that there would be bugs, missing features, breaking changes patch after patch, users' questions and support, etc. And *this* would amount from dozens to hundreds of hours.
I really hope that someone takes over IGE and adapts it for BE. But I currently work 80h a week, I don't even have the time to play video games, and IGE was a 500h+ work over two years.
IGE is open source, the solution is published on sourceforce, it has a GPL license, and the code is more than decent. If anyone wants to take it over he has my blessing. But I won't.