TobiasAT, you are correct, the previous "Secure Links" announcement mentioned that we are bringing One Time Passcode (OTP) experiences to sharing for files and folders. The primary motivation for that change was to not require recipients to create an account in order to be able to collaborate. In addition to the other value that Azure B2B integration brings, this preview keeps that behavior: if you don't already have an account, you authenticate via OTP instead of creating an account (but if you already have an account, you will keep using that account).
ChrisWebbTech, glad you think so! Certainly more awesome stuff coming! I'll pass the feedback along to our UserVoice owners and tell them to get their act together ;)
Stephen Rice
OneDrive Program Manager II