Recently there were several leaks, all pointing to a Q4 2014 release of Broadwell mobile processors. Reuters reported that Broadwell PCs should be on shelves in time for the Holidays. VR-Zone provided preliminary dates of production availability of "Y", "U" and "H" series chips, and their another report placed the release date of "Y" ultra low voltage processors in September or October 2014. This information is confirmed by the latest Intel roadmap.
The first to launch will be "Y" series Core processors with model numbers 5Y70, 5Y10a and 5Y10. They will have 2 CPU cores, 4.5 Watt TDP, and 2.8 Watt Scenario Design Power. The three aforementioned models and two SKUs with unknown model numbers will be introduced in Q4 2014. Intel does not plan to release Broadwell Celeron and Pentium branded products in the first half of 2015.
Full line of "U" processors, characterized by low 28 Watt and ultra low 15 Watt TDP, will switch to Broadwell microarchitecture in Q1 2015.
Broadwell "H" series processors will be launched in Q2 2015. They will have 4 CPU cores, and GT2 or GT3e graphics (depending on SKU). Only mid- and high end CPUs will be transitioned to Broadwell, whereas the low-end Core i5 and i7 Haswell SKUs will still be available at least until the second half of 2015.
Mainstream "M" series will stay with Haswell architecture in 2014 and in the first half of 2015. It is possible that the complete mainstream lineup will be refreshed in the first or second quarter of 2015.
Budget Celeron N28xx and Pentium N35xx "Bay Trail-M" SKUs will be refreshed later this year, and they will be replaced by Braswell products in Q1 2015.
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May 28, 2014: Intel Broadwell GPUs to use HD 5x00, Iris 6100 and Iris Pro 6200 branding
Feb 17, 2014: Intel mobile CPU roadmap for 2014
Dec 20, 2013: Some details of mobile Broadwell CPUs