No way.
If Apple does another CPU chip change to their own ARM, I'm going to be pissed.
But then again, so we really need faster chips at this point for the average Facebook, email, & Spotify consumer? Nope. We need more optimized software.
The reason why PowerPC became outdated, and Apple switched to Intel in the first place, was the RISC instruction set used by PowerPC. I would make no sense to switch to another RISC based chip, with perhaps the exception of the MacBook Air, as RISC CPU's can achieve a maximum of around 1 instruction per clock. To achieve the same speeds on an ARM chip, you would on a modern x86, would require a lot of cycles or/and a lot of cores. ARM has become quite fast, but does not compare to the level of performance you can draw from an Intel chip. For some users, a low power chip, perhaps based on ARM, or perhaps based on the new Atom Core, might be a better solution than your high power i-series, but for devices like the MBP, iMac, to an extend Mac Mini, and of course Mac Pro, such a switch would not make sense, and I just don't see it happening (unless Apple has a magic A8 running at 100GHz with 20 cores).
I think an interesting miss by this article, is the GPU upgrade cycle. First of all, will the Haswell refresh bring higher clocks to the iGPU too? And what about GeForce 800/R7/R9? The CPU isn't the only thing in a computer you can upgrade, and accelerators are becoming more and more important, with AMD's R series having dedicated sound processors on some models, and incredible OpenCL performance, and Nvidia actually incorporating an ARM chip directly on their Maxwell GPUs. Perhaps the general purpose compute speed bump for the next lineup won't come from CPU, but from better accelerators, and more apps using OpenCL, Cuda, CG, and OpenGL for more.
Broadwell not coming out until 2015 is old news by now, but that doesn't mean that this year won't bring interesting update. Better GPUs, faster SSDs, more retina displays, better networking with more 802.11ac, and more could still be in store, and I for one is quite excited for the Maxwell GPU lineup to come. On top of that I'd also like the dent around the keyboard on the retina MBPs to be just a tad bigger, making it more like the (old) non-retina ones... Just in case you're listening Jony...