Anandtech published Intel Discloses Lakefield CPUs Specifications: 64 Execution Units, up to 3.0 GHz, 7 W A quote from the article:

Over the past 12 months, Intel has slowly started to disclose information about its first hybrid x86 platform, Lakefield. This new processor combines one ‘big’ CPU core with four ‘small’ CPU cores, along with a hefty chunk of graphics, with Intel setting out to deliver a new computing form factor. Highlights for this processor include its small footprint, due to new 3D stacking ‘Foveros’ technology, as well as its low standby SoC power, as low as 2.5 mW, which Intel states is 91% lower than previous low power Intel processors. Today’s announcement comes in two parts: first, the specifications.

  Intel Discloses Lakefield CPUs Specifications: 64 Execution Units, up to 3.0 GHz, 7 W