I've had similar experience in-person w/ my area MB dealers, basically a pre-order towards a factory-build & delivery date of September would be at MSRP as of now for a CLA. At least that's how they were posturing & leaning towards, since they themselves didn't have final pricing & build-order capability at the time.
I'm sure once the initial deliveries are made in the fall, and dealers start to have some in-stock in their inventory, there will be some discounting/negotiating from the MSRP. Generally speaking, winter is slow-selling months for most makes/models & inventories build-up w/ dealers wanting to move their stock aggressively into spring.
I'm sure a dealer will likely earn more "profit" from a single well-equipped SL sale than 10 moderately-equipped CLAs sold. It won't necessarily be a high-margin offering, but through volume the dealer will do quite well (espcially if highly spec'd/optioned).
I'm in somewhat of a need of adding a vehicle this spring, I hope I can hold-out till fall when the CLA will be available.