According to some reports I have been reading about JetExpress, it may have as many as 7 cores in the SSD controller, and the PCIe/NVMe version will be PCIe gen 3 x4, which translates to 4GB/s of bandwidth.
The enterprise version is expected in Q2 2015, with the consumer version being available in H2 2015. The consumer version is very likely to launch around the same time as the Intel Skylake CPU, and the Z170 chipset, which will natively support PCIe gen 3 from the PCH, and will also properly support (natively) NVMe. Native NVMe support will also require Windows 8.1 or higher.
Interestingly, Skylake and the Z170 chipset will support 16 gen 3 PCIe lanes from the CPU for graphics, plus 20 PCIe gen 3 lanes from the PCH.
If this turns out to become a reality, the Skylake consumer platform is going to be very attractive to us storage freaks.