Publish Online, while adding new features at a pretty good clip, is still called a Technology Preview.
No such features have been announced. Adobe traditionally doesn't pre-announce features.
I have a similar situation, in my case I need to host this under a secure network. I wont be allowed to host this over Adobe servers because the information is confidential. Hopefully in the future we will be able to export this locally and upload it to the server we chose. Still, this is a nice feature for InDesign.