Our friends and colleagues at Tom's Hardware have a great write-up on understanding the Meltdown and Spectre exploits. If you haven't done so already, make sure you head on over and check out the article.
After two days of whirlwind developments, we finally have more of a complete picture of the new vulnerabilities that impact processors from the leading vendors. Reports initially surfaced two days ago that Intel's processors are susceptible to a new hardware-based bug that cannot be patched with a mere microcode update.