https://eca.state.gov/files/bureau/fy_19_cls_pogi.pdf
Found this link a couple weeks ago if anybody is interested. Pages 2-4 give you an idea of the number of spots for each language they are looking to have. Looks like Mandarin has the most spots! Followed by Russian and then Korean!
I found the document pretty informative.
Actually from what I have found from past threads and the facebook group and some CLS stuff, 20-25% of applicants get accepted as semi-finalists. So about 1000 to 1200! Odds are a bit more in favor xD
500 I think is the number for finalists which is ~10%
Hey, I'm applying for Russian!
From what I have read, sites are revealed to finalists, so you won't know anything until you make it and the sites are released in March.
I could be wrong, though, as I haven't applied before.