1) printing works for me in beta 1, not sure why it doesn't for you :/ Maybe your code isn't running in the first place? (some functions were renamed, like
2) Not sure what you mean, autoload works too. It's likely your old project config was not loaded because it is incompatible with 3.0.
3) Again, works in beta 1 if I do a syntax error for example, and runtime errors get displayed too, although you need to focus the editor (the game window doesn't minimizes).
4) Works too for scenes, didn't test scripts though. If you can reproduce this bug on a simple project, feel free to post an issue on Github.