Has Miyazaki's Future Boy Conan ever been licensed for US release? With the popularity of all things made by Miyazaki, has Future Boy Conan ever been licensed for US release?  

I know it wasn't created by Studio Ghibli; are there some legal issues that might be preventing it from being released in the US?
No, Future Boy Conan has not been licensed within the US.

Although, there has been plenty of speculation as to why this never happened. 

Reasons people speculate include:


being too expensive to produce
fear of it not selling
it being too old 
general licensing hell


Apart from these speculations, there has never been a conclusive answer, nor has it ever been said that it will never happen.  

So it might still happen some day.

Answerman from  Anime News Network also stated the following:


  We have no idea what's holding back the show from the US. I used to think a show like this would be a slow seller -- it didn't exactly blow up the fansub scene back in the day, either on VHS or via Bittorrent. But then again, Discotek just hit a home run with their Castle of Cagliostro Blu-ray so who knows -- it might do OK. Regardless, it's not going to happen in the foreseeable future. Throw another one on the "licensing hell" pile, and hope that, someday, something might change.