Released February 9th, 2021.
One week after 11.2 update, Apple released Big Sur 11.2.1 update to fix some MacBook Pro battery issues and address sudo-related security vulnerabilities. Note that the update will not be offered if SIP disabled with csr-active-config set to 0xFFF (as recommended on Dortania's documentation) but will be if SIP enabled or SIP disabled with values 0x67 or 0x3E7 for instance.
Also released at the same time:
Supplemental Update for Catalina 10.15.7 (build 19H524) Security Update 2021-002 for Mojave 10.14.6 (build 18G8022)