2018/5/14: Screenshot of ARS TECHNICA article about EFAIL (full PDF)
Given the track record of the researchers and the confirmation from EFF, it's worth heeding the advice to disable PGP and S/MIME in email clients while waiting for more details to be released Monday night. Ars will publish many more details when they are publicly available.
Critical Commentary
2018/5/14: Screenshot of ARS TECHNICA article about EFAIL (full PDF)