If MediaPortal is your HTPC software of choice, you might want to check out the complete changelog at the source link, where you'll also find installation instructions if you wanna cut straight to the hands-on.
If you like to live on the edge, the September cycle includes mainline PVR support, which pulls in TV broadcasts thanks to PVR add-ons like MythTV or MediaPortal, as well as integrated support for the Raspberry Pi.