So is history of khorinis still going or this is gonna be the last gothic game we have in a while
If you can speak German or Polish there's The Odyssey- over 200 hours, 1000 NPCs and 430+ quests across Athanos, Khorinis, Nordmar, Myrtana and Varant.
2.0 version was released in 2016 in German, translated to Polish in October last year
How does it compare to Archolos quality-wise?
It's unplayable trash. Zero alterations/improvements to the basic gothic gameplay whatsoever, it even lacks the basic shit that all mods do like fixed permabonus/LP scaling (meaning you can't consooooom your permapotions immediately or you fuck yourself endgame) and it contains like 15 full gothic-sized maps packed to the gills with trash mobs like a fucking mmo. You have zero ability to customize your character (skill progression is completely set by the plot, cannot be a mage or archer in any meaningful sense) and it goes hard on the plot stuff from gothic 3 that nobody liked.
Total misunderstanding from top to bottom of what gothic - or even just an RPG in general - should be. I'd recommend janky amateur garbage like Velaya or Returning before Odyssey.
If you want something actually good, like sort of in the same arena as Archolos but just moderately worse in all respects, try Legend of Ahssun. Another fun one is called "Dirty Swamp" but it's much shorter and more experimental, mechanically.