This is a great update.
I have just tried out ChatGPT Canvas to create a relatively large blog post.
It worked great! Apart from all the new features, I also find it very helpful that text changes or additions etc. are now implemented directly in the text and GPT does not always append a new version at the end.
I'm not sure if this is the way it should be or if it's still a technical bug in the beta version.
But for me, the left canvas/column for text input does not open automatically, I have to ask GPT to do it. Then it works right away.