Here is my reply to a previous post:
The Z97 chipset from Intel, supports the current Haswell (22 nm) and upcoming Broadwell (14 nm) CPUs scheduled for release during mid 2015. Broadwell is essentially a die shrink of the Haswell process.
Broadwell is likely to offer a relatively small performance boost over the current Haswell chips. It is essentially the same architecture as Haswell, shrunk down to 14nm from the existing 22nm process.
(Skylake processors (6th gen CPUs) will be released in the second half of 2015. They have a new microarchitecture, 14nm process, and is more energy efficient).
Broadwell will work in your present motherboard, but for the marginal improvement I do not recommend doing so. Wait for Skylake and see what...