Good review, I enjoyed the focus on the extras - they have to justify the extra price of these special bits of kit, especially nowadays when most, even midrange, boards can achieve decent clocks.
The PCI-E lane switches are a great idea, something I'd like to see on all good boards actually. The ROG connect also looks awesome, I think controlling the BIOS in windows is something that we've been missing for a long time. I do remember having machines in the past, say 10 years back, where you could change BIOS settings in windows though. Remote startup is cool too, something I'd really use if I had the board. I don't understand why an additional heatsink is required though. Why not include a better heatsink as stock? Perhaps make the fan optional instead?
Besides all that, 4.6GHz is really quite impressive, though I'll wait until that BIOS has matured before making any judgements. Certainly promising though, though looks like you'll have to review it over again when you've got an update. I'm sure that won't be too much of a chore ;-)