Android 4.3 was only release a few days ago. I'm surprised they're announcing 4.4 already. Both this link and the BBC article don't have any information about what new features are in this release. Seems pointless to just announce a name.
The next Nexus phone should be out in November. They often introduce the newest version of Android on those (all except the Nexus 4, which came with 4.2 introduced on the Nexus 7).