In short, don’t worry.
Recently, users who pre-ordered Hitman through the PlayStation Store received notifications that their pre-order had been cancelled. The pre-order page itself was off of the Store for a few days but Square Enix has notified Sony of the reason why.
As it turns out, the “configuration of the product” had changed quite a bit and as a result, “We have withdrawn the current pre-order from PlayStation Store and will cancel all existing pre-orders. If you have pre-ordered the game, you will receive email confirmation when your pre-order has been cancelled. A revised pre-order for Hitman will be available on the store soon.”
The game is still releasing on schedule as the official Hitman Twitter states so stay tuned for March 11th. As of now, there are a “few things” being worked on and an update is expected in the next few days. Hitman will be out on PS4, Xbox One and PC when it releases in March.