I've just found some time to mess around with 2.3 in a local test (XAMPP) site and noticed some caching going on.
Not running WP-Cache.
If I look under wp-content/cache I see files show up as I browse my test site.
A) Is this expected behavior? If so, how/when are these cached files updated?
B) Once I'm running on my "real" server, will this cause issues with WP-Cache? Or does this negate WP-Cache?
I can't help but feel like I'm missing something obvious, but I wasn't expecting built-in caching.