I have a feeling that the 15" rMBP will be jumping straight to Skylake. Regardless of what happens, that's the model I am waiting for. Skylake has support for Thunderbolt 3. It will be the model to show us exactly where TB is heading in Apple's eyes. The TB3 port is also thinner, hence why I am considering holding out on the Macbook until the 2nd gen. I believe that it will be thin enough for Sir Jonny's fetish. I also suspect that this is when we will see a new ATD with one cable. If the new TB3 is not thin enough, then there might even be an ATD (USB-C) and a 4K/5K/whatever #K ATD Pro (TB 3)
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