What has been definitely identified on the Cinefacts.de forum are the changes in the audio mix, as this has been reduced dynamically compared to the theatrical experience.
According to information there (http://cinefacts-forum.kino.de/243067-star-wars-das-erwachen-der-macht-26.html#post8393023), the center channel of the BluRay has been “brickwall-limited” (i.e. dynamically compressed), therefore lacking pressure.
Yes, I felt that the opening sequence with the Stormtroopers storming the village lacked something audiowise on the blu-ray, the blaster shots didn’t have the punch I was expecting. Is there any way to get hold of the theatrical audio mix, some Cinema DTS-HD mix out there?