Gizmo_Duck
blathering blatherskite!
from what I'm reading it doesn't appear that there will even be an upgrade option with the ps plus basic version we get tomorrow. You have to buy/own the original non plus version to get the PS5 upgrade in June. The one loophole may be if you buy the DLC that they give you the upgrade then.
This makes sense to me after i saw the way someone explain it. The free upgrade for the PS5 version would create a problem because you are essentially upgrading a free and temporary game for an actual stand alone again. So if you PS+ expires you will lose access to teh original but the way this works is that you would possibly be able to keep the next gen version because its a different SKU