Long time lurker first time poster. I spotted this while looking at PSN store and thought it'd be worth pointing out to those who hadn't bought FF7 remake yet.
There is a digital twin pack of both Remake Intergrade and Rebirth available for Rebirth Deluxe and standard. This pack is the same price as the Rebirth pre-order itself, so Remake Intergrade is essentially free with the pre-order (or you get both games for a very good price depending on how you look at it).
FF7 Remake Intergrade is available to download and play immediately after you pre-order.
Digital Deluxe Twin Pack - $144.95
Digital Twin Pack - $114.95
Hope this helps!