How many characters are included with the early access launch?

A substantial roster of 9 characters are available at the launch of early access. Many more will be added over the course of early access.

What single player features are available at the early access launch?

There's a tutorial to play through to learn the game. In addition, you can play "single match vs AI" at four different difficulty settings.
The main single player mode is the career mode which allows you to play against hundreds of AI personalities at 9 different locations. Only a small fraction of this mode is available at early access launch. Substantial additions to it will come over the course of early access.

What multiplayer features are available at the early access launch?

Online (synchronous) play is available and supports cross-platform opponents who have the Steam version of the game. In addition, there is a pass-and-play mode for local play.

Will the price change over the course early access or at launch?

We do not anticipate changing the price. Our plan is to keep adding features and content over the course of early access.