I haven't read a rumour about the rMBPs in ages.
Just read this:
While the Retina MacBook Pro received a minor update on July 29, delivering 200 MHz faster Haswell processors and increased RAM on low-end stock models, a more substantial update is expected in 2015, when Intel's long-delayed Broadwell processors become available.
and
Skylake is the codename for a processor microarchitecture to be developed by Intel as the successor to the Broadwell architecture. Skylake will use the 14 nm manufacturing process.
So, looks like the Skylake processor might be worth waiting for, IMO, but not sure when it will be released. I was planning on buying the Broadwell, but I may just wait for the Skylake.
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