I suppose it's silly to even ask, but I'm guessing this means that the option to connect directly to iPad (even though somewhat depreciated) won't work either as an alternative?
I have been attempting to set up the content-server option, but after hours of trying, I am left completely stymied. It may seem easy to others, but I'm at a loss there. For the moment I have my calibre library stored in my DropBox folder, and I'm manually importing things to ibooks, but it means after reading, I now have to think about deleting items in multiple places (calibre, iTunes, iPad, etc.) rather than managing it all via calibre with iTunes connected.
The iTunes option was so easy and manageable for me, and this just...sucks.