Sounds like BMW will be doing what Porshe has done for years with there T Equipment line. This does not come as a surprise to me.
Problem is that Porsche in house performance products are extremely expensive over the aftermarket. I would not be surprised if the case is the same with BMW.
I dont think BMW cares about selling performance products that could put the 335i close to M3 performance. Honestly, the M3 buyers will always be there. I have always said that the price premium some of us are going to pay for the M is going to deter some previous M buyers from purchase. The 335i especially one with Msport gear like a rear diffy is going to catch those disenchanted M buyers. I am sure there will be performance products for the M3 as well.