There is little data to support any supposition.

I would expect items like window regulators to continue to be problems, and miscellaneous electrical faults to increase slightly due to the increased complexity of the vehicles. Transmissions are different (6 speed) but there is simply no solid data yet.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue