Where? Isn’t V4 still unreleased?
http://apollo-core.com/knowledge.php?b=1¬e=23461
There was a good article about it here that was on HN a few days ago:
https://www.forbes.com/sites/marcochiappetta/2019/10/22/the-...
I may have mixed things up, I'm not closely monitoring this, but I think you could pre-order it somewhere. Maybe it was only existing customers or something, it was something I saw on the FB group I think!)