A quick summation of the things members posted till now
List players still hungry for more or just not satisfied with the currently available
-Customisation options for cars
-New songs for the radios
-Underwater exploration and other related activities
-Properties to Buy, Safehouses and Garages
-Gang related tasks and action
-Random chases, gang shootouts, kidnappings and other criminal action
-Opportunities to utilise many areas on the Map, eg:missions involving the Prison and Military Base
-More depth to the mystery of Mt. Chilliad mural. UFO-goverment plot and missions.
-Patches and Fixes to the Cop System, Ped AI and other game issues, ex:Stealth
and much more ... (according to previous pinned topics)
List Previous GTA's had but not present in GTA V
-Vigilante Missions. Same applies to Ambulance/Firetruck missions and Collectibles. What we require is some changes and improvements to such missions with a new mode of gameplay to enjoy.
-Access to Shopping Malls, Casinos, Random Houses, and other common interiors, ex: Restaurants.
-More activities like Basketball, Pool, etc
-The Horsetrack and Gambling
-Dancing minigame like in TBOGT
and so much more ... (according to previous pinned topics)
That's only the most basic wishlist we should have actually already been loving it in the vanilla game (as in every previous GTA offered except GTA IV).
Regrettably, we are STILL waiting it and expecting as "DLC".