Seems very limited for an IDE. Only certain web frameworks permitted for now, python and go support is still not there, and Flutter is the only choice for cross-platform apps. Android and iOS simulators aren't built in yet either. Given the blog title and the blog itself, I was expecting a bit more and something less piecemeal rather than what is actually presented here which is an online IDE mixed with google AI.
This seems tailored to being good at doing front end stuff (multiple emulators, multi-browser previews, etc). Which is probably a problem google deals with themselves.