It'll all depend on how the Streetcar production is welcomed. I personally was not a fan. If the critics go crazy, it's in. The Best Man will probably get a nom, since it's still running, but I suspect that's the only reason it would be nominated.
I think the 5 shows slugging out for those 4 slots are WIT A STREETCAR NAMED DESIRE MASTER CLASS DEATH OF A SALESMAN THE BEST MAN