Is there going to be a NWN: Enhanced Edition DLC that upgrades Standard Edition to Digital Deluxe Edition?

Actually there's no Digital Deluxe Edition at this moment. It was removed some time ago. Now you have to buy all of the DLCs separately. The price will be similar to the former price of DDE. You can wait for the summer sale, if you don't want to pay the full price.

Oops, I read you initial post incorrectly lol.
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Actually the Digital Deluxe Edition is back on GoG. I think it is something very recent from like the begining of this month. I found out myself from the e-mail they sent me with a discount code for it.

I doubt there is going to be a DLC as an upgrade because the Deluxe Edition is just a collection of the base game/+expansions/ + all the modules/sountracks that you can buy separately any time you want. But what I hope they do one day is something similar to Steam where these Deluxe Editions are made as bundles and if you own anything from that bundle already the price will be lowered similar to how steam deals with bundles prices so you don't have to buy things twice while you can still benefit from the discount for that bundle

Btw currently there is a massive discount for the Deluxe Edition of 80% and for me the price is down to 10.59 euro which is really good price and even though I own the base game already I wonder if I should buy it again. The discount will be up for 11 more hours. You can find keys for it in the general forums - there is a thread for newsletter keys/also on the gog reddit there is a thread/ !

GL !

I've checked it, and you're right of course. The Digital Deluxe Edition is back indeed.