Wow. So it's mostly unfinished inside?
Also, consider what happens to concrete being exposed like that for two decades. The concrete isn't meant for decades of weather, it's meant to be enclosed. The concrete degrades and becomes unsafe. Same thing has happened with a lot of the Dubai skyscrapers whose construction was halted, and they were only exposed for a few years (so says a Dubai contractor friend).
I doubt that their plan is to use the hotel exclusively as a giant antenna, but it's not unlikely that finishing the facade was a political priority, while operating the hotel is not.
[1] http://en.wikipedia.org/wiki/Orascom_Group
[2] http://en.wikipedia.org/wiki/Ryugyong_Hotel#Construction_res...