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edit: I wasn't able to find anything new since Jan 3rd about the speculative bypass from Project Zero.
Some additional articles about the newly revealed Variant 4:
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Variant4
https://xenbits.xen.org/xsa/advisory-263.html
https://www.cnet.com/news/intel-microsoft-reveal-new-variant...
https://newsroom.intel.com/editorials/addressing-new-researc...