Clan Halls
Clans are great for finding like-minded players to explore Sanctuary. I urge the devs to introduce a new feature, Clan Halls. Clan Halls would be instanced areas for your clan mates that come in various sizes for purchase, such as a cheap cottage in Ked Bardu to a very expensive manor in Kyovashad. Clan Hall would feature a Clan Vault where players can donate gold and serve as a shared stash. You could upgrade the hall with furniture, add blacksmith, training dummy, etc.
Mount Variety
Mounts are essential for crossing the vast expanse of Sanctuary, but the devs should add more than horses, such as bears, wolves, camels, elk, yak, etc. Obviously, keep the mounts natural and avoid high fantasy mounts like unicorns, etc.
Pit Leaderboards
With the addition of the pit, a natural progression is to add pit leaderboards that shows the top softcore and hardcore characters with the highest pit clears and would reset with every season.
Group Finder
The developers should add a Group Finder to give players a tool to join groups who are looking to run a specific dungeon, world boss, etc. This promotes social interaction and improve the multiplayer experience.
Town Portal Default Location
In Kyovashad, there is an Innkeeper NPC named Raskya (downstairs from Wardrobe) that should offer a menu that gives the player an opportunity to set the default location for your Town Portal.