MediaPortal 1.5.0 Final has been released, the pre-release version had been available for a couple of months and this is the finished product. Version 1.5.0 has CableCARD support and new IPTV standards. DRM restrictions still apply so would premium content is still not available in Mediaportal but anything marked copy freely will work.
There is also improved video and TV recording thumbnails and Windows 8.1 support is added but you are out of luck if you still running Windows XP.
More details a team-mediaportal.de