All green
https://build.neon.kde.org/view/4%20release%20LTS%20%E2%97%8E/job/xenial_release-lts_kde-extras_kjots/

watch file doesn't check .sig
on startup I get a warning dialog 'There are two actions (Bold, Add Bookmark) that want to use the same shortcut (Ctrl+B). This is most probably a bug.' consider filing a bug?
needs bigged up on neon's twitter/plus/facebook feeds

https://bugs.kde.org/show_bug.cgi?id=384000

I am not sure I understand where to get these keys from

shrug, bug is reported that's fine.
watch file still needs a gpg key that works for it

Ok, finally sorting out these gpg keys, this is done now, please recheck and close this :)

have you bigged it up on social media?

oops, no, let me do that now

Done!