DirecTV added streaming functionality for iPad last fall, but users were restricted to watching their content on the same network of their DirecTV receiver, meaning that one basically had to be at home to see anything. The DirecTV Everywhere streaming upgrade allows users to view OnDemand content from premium movie channels like HBO and Showtime, as well as DirecTV's own Audience Network. Still, users won't be able to watch live content while away from their home receiver, and the upgrade doesn't include TV shows at this time.
While DirecTV hasn't released an official statement on the upgrade, it appears to be following suit with other providers in their push of streaming video content - Comcast launched Xfinity Streampix in February to compete with Hulu and Netflix.
To further compete with the other providers, it can be assumed that DirecTV will in time make more TV shows available through its upgraded streaming service.
In related news, DirecTV just tapped Charlie Sheen to appear in its new commercial:
Reviews appear to be mixed, but I think it's pretty funny.