Here is a link to an article about some of the technological advances of the upcoming 7er. Its in german , but it contains some pictures of the new improved nightvision screen :

Der neue 7er BMW - Blick in die Zukunft - Auto & Mobil - sueddeutsche.de

Here is a brief summary :

The first part deals with the improved nightvision system:
- infrared based (like current system)
- higher resolution
- can detect pedestrians within 100m range
- Warning will be displayed (in central display and head-up display) , if on collision course
- can detect, if pedestrian is on 'safe' sidewalk... in this case no warning displayed, just yellow highlight
- sophisticated recognition software

The second part deals with the new 7er's capability to detect traffic signs.
All standard traffic signs (according to Convention of Vienna ) are detected and displayed. Driver is warned, if exceeding speed limit. Works together with HDD based Navigation system.

Looks like a lot of techno goodies will be put into the new 7er