Intel's ultra low power lineup is going to be refreshed later this quarter. The company will replace i3-3217U, i5-3317U, i5-3427U and i7-3667U CPUs with Core i3-3227U, i5-3337U, i5-3437U and i7-3687U, essentially boosting their clock frequencies by 100 MHz. Furthermore, there will be another Core i5 model, i7-3537U. That CPU has surfaced in specifications of HP (PDF file), ASUS and Dell notebooks. More importantly, the processor appeared for short period of time on Taiwanese and Korean sections of Intel's website. Although all references to the processor were removed from the Intel website, they are still available in Google cache. The cached page also contains brief information on unreleased Core i7-3687U and i7-3540M chips.
Cached page on Intel's site states that the i7-3537U will operate up to 3.1 GHz. The processor will have 4 MB L3 cache and will be produced in a BGA package. Specification pages on HP and Dell website add a few bits to this. The CPU will have 2 GHz stock speed, which is 100 MHz higher than the Core i7-3517U. The i7-3537U will come with HD 4000 graphics, support DDR3-1600, and will fit into 17 Watt power envelope. We believe that remaining features will be identical to i7-3517U, i.e. it will have two CPU cores with Hyper-Threading, and support most of Ivy Bridge technologies and extensions to the instruction set. At this time we don't have information on the launch date of the Core i7-3537U.