The Anniversary Edition includes Skyrim Special Edition and 74 creations
So 74 mods of unknown size.
These showcase over 500+ individual elements such as quests, items, armor, houses, etc.
With 500+ "elements" including "etc." ... so who knows, but 500 is a number that sounds nice in marketing land I guess.
If they fixed mouse movement and let me bind right and left hand to single hotkeys on the PC I' might buy it. If they rebalanced combat and difficulty levels I might buy it. If the survival mode came with a difficult setting like Fallout 4 where enemies hit hard but aren't turned into ridiculous damage sponges like Legendary, that would make it a bit tempting.