Don't take me 100% on this, but as I was running around in NY on Monday, trying to get tickets at a bunch of theaters...I'm pretty sure that they didn't have one- because I asked them there and I'm pretty sure that the answer was 'no.'
(i realized that it didn't help at all- if anyone could back me up on my answer?)
I saw it in its second preview and as of then they had no rush poilicy, but they had tickets at TKTS, so I'm sure you can get one there. I had an excellent seat for $33.