I've got some information for you. (I'm being dragged everywhere at the moment)
With regards to pre-order, we are looking at right now (so 4PM BST. 15/04/2020):
Some websites (Amazon UK, Game UK etc) have gone live with game pages and pre-order options
Steam should be updated and going live soon
Xbox should be a few days
We are expected PS to be around May due to others factors
I hope this helps.