I think they will offer the 2.5 Because competition is heating up in the Roadster market and offering a 2.5 vs a 2l adds almost nothing to the cost and very little weight. The 2l may be a base option. I don't see them going for less power. The 2l would be a nice engine with great balance, but the 2.5 will satisfy the power hounds and start nibbling at the Z4 and SLK market.