Amazon.de have put up a listing for Star Trek: The Next Generation - The Next Level; The TNG HD sample disc which has been recently rumoured. The listing confirms the rumoured episode list (Encounter At Fairpoint (parts 1 and 2), Sins of the Father, and The Inner Light), gives a release date of December 15, and has this artwork:
Keep an eye on the 2011 schedule page for updated links to Amazon listings in other countries when they appear. Exciting!
UPDATE: The TNG HD project and sample disc have now been officially announced, and the release date for this first disc will be 31st January 2012.