It's probably more. Based on public numbers/guesses (Harj:
http://www.quora.com/What-percentage-of-companies-that-get-a...,
http://www.quora.com/How-many-people-teams-get-rejected-by-Y...,
http://www.quora.com/What-percentage-of-Y-Combinator-applica...) and some handwaving, last cycle was roughly 1000 applications, 10% got interviews, 4% (40 startups) got in. This cycle there's already ~145 slots taken, so I'd guesstimate 1500 applications (all else staying constant, etc) minimum. Maybe more like 2000.