VR Zone has exclusive details about Intel's Ivy Bridge quad-core processors designated for OEMs, you can read about it over here.
The additional quad core models are similar to the lower-end Sandy Bridge quad cores such as the Core i7-2630QM all the way up to the 2675QM, models you'll find in notebooks from big brand name players such as Dell, HP, and Lenovo etc. The OEM Ivy Bridge models are the Core i7-3615QM, Core i7-3612QM and Core i7-3610QM, all of which sports 6MB L2 cache, support for DDR3 1600MHz memory and a base graphics clock of 650MHz which for reference is very similar to the Core i7-3720QM.
Intel seems to have gone and made things all confusing with its model numbering scheme here though, as the Core i7-3615QM is a 2.3GHz part with a top turbo boost speed of 3.3GHz and unless there's a typo or two in the information we've seen, then this CPU is identical to the Core i7-3610QM. The Core i7-3612QM on the other hand is slower with a base clock of 2.1GHz with a top turbo boost speed of 3.1GHz. That makes these by far the lowest clocked Ivy Bridge processors and although we don't have any TDP specifics, we have a feeling that these are the 35W parts Intel has mentioned in the past.