This post comes directly from RFE/RL. So, the details of the story can be found there.
Basically, there is impending constitutional limbo following the disputed South Ossetian election last week. The current president’s mandate ran out on 7 December. However, so far, no constitutional arrangement has been made to extend his term, given the official annulment of the recent presidential election. If the term is not extended, the power devolves to the PM who has been in dispute with the president for some time.
Meanwhile, the ‘winner’ of the election, Alla Dzhioyeva, has been barred from standing in the proposed re-run of the election next March. She is still threatening to go ahead with an ‘inauguration’ in the next few days, but there are some signs that she may back down.