It's getting it via the 4G LTE connection. Up till now the source has been Tom Tom, and prior to that SiriusXM via satellite radio as in your E350, but the latest COMAND 5.5 system is using Tom Tom. The 2020 GLS gets MBUX and I can't currently find confirmation whether it still uses Tom Tom or if they switched the provider, but it'll still be over the 4G LTE connection. Traffic and all the other online services are included free of charge for the first 3 years. After that you'll have to renew and pay for them. Tom Tom as a provider appears to be going away. Current E-Class owners who have exhausted the 3-years are finding that they currently can't renew live traffic and no clear word from MB as to what is going to replace it. New cars are still getting live traffic from Tom Tom. In my new 2019 C63S it was just activated a few weeks ago, so I should be good for the next three years. I'll see what the deal is in 2022 when I'm up for renewal if I still have the car by then. The Tom Tom traffic is actually pretty good. I've had SiriusXM in my previous Audi and it was ok. Mainly just highways, though. Tom Tom has traffic information for surface streets as well and so far it appears pretty accurate, so I hope that whatever they replace it with is as good or better than Tom Tom.