After the Bing Chat AI sidebar showed up, it looks like Microsoft is ready to offer its ChatGPT-powered Bing Chat AI to anyone who wants to use it. It's still listed as "join the waiting list" on the signup page, but when you sign up, it looks like you get instant access. I got access to the feature a few weeks back.
Microsoft hasn't confirmed this change, but it is holding an event today on "Reinventing productivity with AI." The focus might be more on its tools for the Microsoft 365 suite, but there might be new changes to Bing. Microsoft confirmed recently that the new Bing runs on the GPT-4 engine for the last few weeks, well before OpenAI unveiled it.