Codemasters announces that F1 2016 multiplayer support will accommodate up to 22 racers per game, and will introduce features such as the formation lap and manual starts. This post has the details along with screenshots and a new trailer. Here's a bit on multiplayer support in the racing sequel:

“Increasing the multiplayer support to 22 players was extremely important to us,” added Lee. “We want to be able to fill the whole grid with human players to create those great race moments and stories. It also provides greater support for online leagues.

With multiplayer support for up to 22 drivers, F1 2016 allows players to form a full grid of human players across the 21 circuits featured in the 2016 FIA FORMULA ONE WORLD CHAMPIONSHIP, including the tight Baku street circuit, the latest addition to the calendar. In single player, gamers are able to create their own legend in the expansive Career Mode which stretches for up to ten seasons and includes drama both on and off the track.