In the official editorial on the latest Spectre-type variant, Intel states:
Expecting that this category of side-channel exploits would be no different, one of the steps we took earlier this year was expanding our bug bounty program to support and accelerate the identification of new methods. The response to that program has been encouraging, and we are thankful for the continued partnership we have with the research community.
As part of this ongoing work, today Intel and other industry partners are providing details and mitigation information for a new derivative of the original vulnerabilities impacting us and other chipmakers. This new derivative is called Variant 4, and it’s being disclosed jointly by GPZ and Microsoft’s Security Response Center (MSRC).