u/Blitcut

Confirmed to be a new IP so not Stellaris 2.

To add a bit more speculation the discussion, reading the description of how much of an MMO GW3 will be

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>Guild Wars 3 lands near the middle of the MMO spectrum, which supports the goals we have for our movement and combat systems. While it fits the definition of an MMORPG significantly more than Guild Wars Reforged does, it doesn’t try to replicate the large-scale gameplay pillars that so uniquely define Guild Wars 2.

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I think something the size of New World would fit the bill. So in other words, players running around and doing stuff side by side. But not the large zergs (i.e. large scale gameplay) doing group content like in GW2.

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Another key thing here is that GW3 shares two important aspects with New World from a technical perspective, action combat and a large open world. New World has thus shown what kind of player density is viable with those two aspects together and by extension a density GW3 can realistically aim for.