Round 14 was around 2500 i think, but because of the fact that it was a summer round, i expect this will grow to about 4500 (ok, that might be a little too optimistic) but considering we had a 4 month gap between r12 and r13 and still managed to exceed 4000 i think there is a strong chance for a repeat.
Anyway, nice to see that you've enjoyed the PaX style of things, the game is alot better now. However, you're encouraging all oldies to play? Tell them, not us!