The 2013 Audi A4 and A5 models will have a T-Mobile 3G (possibly HSPA+) connection and will come with In-Car Wifi so that up to 8 devices can be connected to the internet.
These new A4 and A5 models will also include a built-in navigation system with a Tegra processor and a large touchscreen built into the dash. The system does not appear to be running any sort of OS (Android or any other mobile OS). This is going to kick off what is the beginning of internet connected cars on the roads and it looks so great.
Mark Cathey's Tech Site 