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While there is not a vapor collection system, the valve covers do have baffles leading to the hoses that go to the turbo inlet pipes. The baffles supposedly do a pretty good job trapping oil. My 08 535xi had DI but a different vent system with PCV valves and the amount of goo in the intake ports at 90k miles was surprising — they were about 1/4 blocked. It looks like it would be an engine out job to clean the intake ports on an F90.
I have been running water/meth injection for a couple of years on my F90. It goes through the intake manifolds and supposedly helps reduce carbon build up.
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