The Haswell Refresh just hit the market and in Q4 2014 we'll see the launch of the Core i7 "Haswell-E" series. The latter chips feature the new LGA2011-3 package and will require a motherboard with the new X99 chipset. Haswell-E will introduce DDR4 memory to the consumer platform and will reign until late Q3 2015 when Intel plans to launch the 14nm Broadwell-E, which promises to be supported by the same X99 platform.
Broadwell is now expected to make a debut in Q1 2015, these processors should be supported by existing LGA1150 motherboards after a BIOS update. Broadwell will have a very short shelf life though, the roadmap reveals Skylake is anticipated to hit the market just six months after Broadwell's launch. Unfortunately, while there will be some unlocked K-series Broadwell processors in Q1 2015, it seems overclockers will have to wait until 2016 for unlocked Skylake processors. Skylake will require a new motherboard as it introduces the LGA1151 socket.
The roadmap also reveals Intel's plan to launch Broadwell BGA chips a couple of months from now, followed by Skylake BGA processors in mid-2015. These are sub-25W models designed for ultra-low power desktops. The entry-level J-series will see the scrapping of the Atom brand, with Celeron and Pentium "BayTrail-D" extending to late December 2014 before being replaced by Braswell-D in early 2015.