If there is an unlocked dual core along with improved memory clocking, I will get a board and cpu just for benching fun.
Yes, there should be some special edition Pentium with unlocked ratio.
Regarding boards. All Z87 boards dedicated for OC already have option to set memory @4GHz+. Main issue are memory controllers. In my case my 1st 4770K made ~3850MHz but all other that I had couldn't pass ~3500 even though memory clearly could make more.
All manufacturers could already mark their boards as 4000+ OC as it's never guaranteed ... option is available but in most cases it won't work anyway because of CPU.
There are Avexir modules 3200+ available for some time and they're working without issues on some boards like ASRock OCF ATX/mATX and some other.
I just hope that memory controllers will be improved in new Haswells but premiere of K chips will be in 1-2 months so we have to wait some more.
I'm also not sure if that unlocked Pentium is going to have higher bclk ratios. Current Pentiums/i3 have only 100MHz bclk so max memory clock 2933 and it's even working ( at least on my i3 4330 ). Also max bclk for most Pentiums/i3 is max ~103-104MHz.
There is also one question if unlocked Pentium will be in reasonable price and easily available. In current prices up to ~$100 it can be interesting but anything above already has no point to exist with 2 cores.
Unlocked 3 cores +HT would be fun
There is one more thing that some maybe noticed. If you buy Pentium then you can't use Intel SSD caching options. It's working on i3 or higher CPUs but not on Pentiums.