I just hope it being a FWD biased system it won't feel front wheel drive biased. Some of these front wheel drive biased systems don't feel front wheel drive at all, some feel like a true AWD system, like what Subaru has.The airbags seem to be an option for the US as well according to the CLA US Ordering Guide.
I am curious to why there is little information about the 4Matic system.
This is all I could find about the 4Matic system and it is regarding the A45 AMG model rather.