Ubisoft just posted an extremely detailed blog post documenting changes being made to Rainbow Six Siege based on data and feedback gathered from the October closed beta. It's also filled with fun little graphics like this:

R6 Blast Radius Graphic 228127

The entire blog is well worth a read, as both a document of how the launch version of Rainbow Six Siege will differ from what you've played in the betas and as a glimpse into the game development process in general. Check it out here.