Cool [Q] Options for upgrading to KitKat from 4.2.2 with TWRP

I stayed on 4.2.2 rooted with TWRP and never took the MJA/MK2 OTAs, to avoid knox. I've been waiting for KitKat, and I'm ready to take the plunge. I've read through a bunch of threads, and have thoroughly confused myself. I have a few basic questions, so I can determine what my options are:

1) Is it possible to go from MF9 (rooted) to NAE, and retain my data? What happens to the modifications I made to MF9 (hotspot, xposed, etc.)?
2) If the answer to 1 is no, is it reasonable to assume that there will be a flashable NAE rom in the near future, so that I wouldn't have to odin to MK2 before going through the OTA update to NAE?
3) Should I give up on trying to keep my existing bootloader, and just suck it up and take knox? It seems like there's probably enough differences in the rom and modem that the bootloader is probably a necessary evil at this point.

Thanks in advance for your help.