Grand Theft Auto V will be getting more single-player downloadable content in 2014, which will continue the story of Michael, Trevor, and Franklin. Rockstar announced the plans in a blog post, among assorted other DLC bits.
In a post on the Rockstar blog, the studio promised "substantial additions" for the trio of protagonists. It didn't mention if this will continue the story after the main campaign or be set at some other time, however.
In the multiplayer arena, Rockstar is introducing new Deathmatch and Race Creators tools this week, letting you make your own Deathmatch, Team Deathmatch, Race, GTA Race, and Rally Race matches. It will be reviewing the player-created content and highlighting some as "Rockstar Verified Jobs." This will be in beta starting tomorrow, with the official release following after the kinks are worked out. December will also see the addition of Capture, the GTA take on classic CTF modes.