I don't think low level set plan transfer to RoS after being learned. In PTR my lower set Asheara's and so on do not show up at the blacksmith.
Not to be the tech support guy that asks you if you've tried restarting your computer, but do you have any of the crafting filters turned on (like "Have Materials" or "Highest Usable")? I only ask because I remember reading that people would just know how to make the new version of the crafted legendary instead of the old one (if they'd already learned it), since those items don't scale in level.
No the plan that are lower than 60 seem to have Not transferred at all into the blacksmith. My higher leg and set plans are there though. So what I am saying is do not waste your money on buying cain's right now as there will be a new cains anyway.
EDIT I will check PTR again today to make sure no filters are on as I have spent alot also on plans. Will report my findings. And yes there are new versions of all sets I believe.