Till last week, I reviewed both first-post and late-answers. today, I can't. It says that the users with 500 reputation can only review.
When did this happen?
The why was apparently decided during a close look at all the privileges that happened last week on a network wide basis.
There was some discussion that this review would be better placed at 1k or even higher, but on sites like ours with lower voting - the bump to 500 removed a larger fraction of total reviewers than on sites like stack overflow.