Just like in 6.0.1, you will have to most likely wait for a modified boot image to be made available that disables the same stuff in 7 that it disabled in 6.0. Once you have that, it all depends on how you are upgrading. With an OTA, it is a little bit more tricky since you have to reflash the stock system, boot and recovery images before taking the OTA (either automatically or sideloading it). Then once you have the OTA loaded, you will have to then load the modified boot image, your custom recovery and then go into the recovery and re-root the phone. And that is if you stayed encrypted. If you are unencrypted, it could get messy.
To a seasoned flasher, it's pretty straightforward work, but if you aren't comfortable with things, it can go south really fast...