Very unlikely, though possible, you'd probably have to delve through a lot of Intel specific release info to find out for sure. You'll almost undoubtedly need a chipset capable of supporting 64Gb because it's usually split into 4 DIMM slots. With only 2, ITX usually carries half of the maximum available. Remember that the current Haswell chipsets already have a maximum capacity of 64Gb (with the exception of H81 - due to it only having two memory slots as standard, or one DIMM per memory channel).
You can't really blame them, the only tasks that require vast amounts of RAM are fairly high end workstation kinds of tasks and very few people (to the best of my knowledge) are using ITX as a workstation format (though NUC-esque systems are becoming increasingly common for lower end tasks).
Also, I'm not sure if Broadwell-H is A) what you are looking for B) if it will be available at retail in the same way Broadwell-D is. For most high end ITX users, Broadwell-D will be the platform to be using.