LineageOS has detailed the software changes that have been implemented since September 23rd, and the list of changes and feature improvements/additions is fairly extensive and contains a lot of useful information on what the software now includes if you're someone who is using LineageOS on their device, or plans to use it. Naturally, not all of the changes will be that major as some will be more behind the scenes or simply just minor changes that are meant to make tiny improvements where needed. Nevertheless, every change is likely to be a necessary one even if it's small.
For those wondering, Oreo is not part of the changes that have been implemented yet and are not technically part of the changelog, however, LineageOS does mention that there are some unfinished and unofficial builds of the Oreo software build out there and are meant to deliver some of the features that will come along with the final and stable build. The team is also anticipating moving straight to an Android 8.1 Oreo build instead of Android 8.0 now that Google has already released the former, which means users may have a little bit longer to wait in the meantime as LineageOS plays catchup with the new changes.
As for what's new in the changelog for the software since September 23rd, one of the biggest changes/improvements is the KRACK Wi-Fi fix, which has now been implemented and that means LineageOS as a software is up to date on security, meaning users can now have a little more peace of mind that there devices aren't as vulnerable as they were. The November Security patch is included too, so the security patch is almost up to date. Other things like the an improved battery icon as well as support for extended length NFC are things which LineageOS has added in the past couple of months to the software, and a tile has been added in the quick settings menu for the LiveDisplay feature, so if you use that often enough then being able to toggle it and play around with it more easily then before is likely to be a beneficial change. There are a handful of other minor changes included too, and you can find the full changelog from the source link below.