There are only few items that are problematic, i think i could worked that out.
After testing Kx12 and adjusting most of the items and skills , it will be launched
but K11 will still be around for ...hmm maybe 3..6..12 months.. (dont know just yet or maybe never)
So if you want to stay in k11(ork4) then stay in k11
p.s. migration will include your chars and current level