Maybe they will say, but usually, publishers won't comment on upgrades pre-launch because they want to present consumers a simple choice between standard and deluxe. There's an implied pressure to make a choice about having the 'extras', that would be lessened if an upgrade was available.
So let's see what happened with Battlefield 1 which launched October 21st, 2016.
Up until October 16th, 2016, EA support were saying 'we don't know', 'wait and see'. On October 18th, 2016 an upgrade pack was launched for $20 (on console) but I don't see it on Origin.
That's not a guarantee the same will happen with Battlefield V, but it seems probable (depending on platform).
So, conclusions:
- The upgrade is likely to happen, just not guaranteed.
- You can cancel/refund pre-orders and buy the other one (support can help).
- But EA Play is 2 weeks away, you really can't wait until then to decide? That would be much easier.