"Hopefully, BMW will incorporate gasoline DI with their bigger I-6 engines, which could improve fuel efficiency 15% or more because it allows for more lean-burn combustion without exceeding EPA Tier 2 Bin 5 emission standards."
I believe the BMW 3.0 liter inline gas six for 2007 has DI; as do Audi engines. Audi since about 2005.
BMW has no 4 cyl. engines for sale in US at this time.