Temm,
The way to look at the 4S is not turbolook like the 993 and 996 but like the previous generations.
It is just the 355 hp version of the 4WD 911, that's all.
Potential costumers should be happy it comes with wider body, judging from the picture, it's actually very nice, I like it!
I think, in due time, there will be turbo looks version for all models (just like the old days! ) but only once the actual 997 Turbo has been introduced.
I'm speculating though, but that's the way I see it.
No new 4WD system, never mind, viscous coupling is nice as it is, same system than on 993 and 996.
If it ain't broke, don't fix it!
Maybe a more advanced system will be introduced with the Turbo with active differential Yaw control etc.

PS: Very nice pic, I like those hips! Sexy!