I'd say we're looking at anywhere from 70 to 80 percent of the class full right now or somewhere in the vicinity of 190-210 / 250ish available.
One thing to think about is that PCOM offers interview dates oddly... someone just got an interview for mid-March...but days before someone on SDN had been offered one on March 28th. When I interviewed, I received an earlier interview date than someone who had been notified a week prior...
They are probably still actively inviting for the end of March... but like Jonny said, if submitting now (barring a 4.0/30+ stat combo) you are most-likely just throwing your money away... PCOM took 3 months to get back to me. I was complete in mid-October and heard back early January.