US President Biden this morning issued a National Security Memorandum on Improving Cybersecurity for Critical Infrastructure Control Systems. Among other goals, the Memorandum seeks to initiate development of "baseline cybersecurity goals that are consistent across all critical infrastructure sectors, as well as a need for security controls for select critical infrastructure that is dependent on control systems."
REvil may have reconstituted and rebranded itself as BlackMatter, although it's difficult to be sure. Forcepoint has found chatter on the "high-tier Russian-language illicit forums XSS and Exploit" that suggests BlackMatter is REvil's successor. BlackMatter registered itself on July 19th; two days later they advertised for people willing to sell access to large Western corporations. Recorded Future says that BlackMatter claims to have incorporated the best (in a criminal sense) of both REvil and DarkSide.
REvil announced its occultation on July 13th, the same day XSS banned REvil's spokesman from the forum. BlackMatter doesn't openly claim to be either REvil redux or a ransomware operation, and so keeps narrowly within the forum terms and conditions, but the wink-and-nod circumlocution in BlackMatter's chatter suggests to Forcepoint that that's indeed who the new group may be.
Another ransomware gang that may be the successor of older, notorious groups is Haron, whose emergence is described by S2W Lab. Harron's approach incorporates features of both Thanos and Avvadon. So far Haron has publicly claimed only one victim.