In a press conference today, Marvel executives confirmed that the Marvel Universe and the Ultimate Universe are ending and that a new Marvel Universe will be built on the foundation of the Battleworld which is the setting of their Secret Wars series.
At the conclusion of the press conference, Marvel teased the All-New Marvel which will be the result of the Secret Wars series.
The original Secret Wars series was published in 1984 as a way to garner attention for the Kenner line of Marvel toys that were hitting the market. The new Secret Wars series is being written by Jonathan Hickman (Avengers, New Avengers)
UPDATE: You can watch the entire Secret Wars press conference below