The doors have closed and all the late comers for Day 1b have been counted. A total of 2,114 came to play Day 1b, making the total 3,180 thus far.
Referring to that overall total of 3,180 (adding Days 1a and 1b), WSOP is saying "at least that many more players [are] expected" for Day 1c.
In other words, it sounds as though this year's overall turnout for the Main Event may be rivaling that of last year when 6,865 played. We'll see for sure tomorrow after adding up the last of the three Day 1 flights.