The Sun released a short clip of Sky network's preview into
Half-Blood Prince; the video shows new interviews with Rupert Grint and Emma Watson talking about the romance in the sixth film, as well as Ron and Hermione's relationship. Throughout the preview there are numerous behind-the-scenes clips, including Ron and Hermione in Knockturn Alley, and Hermione and Lavender's row in the Hospital Wing. It can all be seen below.
We will have Sky's full preview as soon at it is made available.