[steveklabnik]

It is not too late to get things into Rails 4. We haven't released a beta yet.

One of the things Rails 4 already features is better error pages, though no REPL.

[banister]

REPL requires [binding_of_caller](https://github.com/banister/binding_of_caller) anyway, which i doubt rails would include any time soon ;)

[steveklabnik]

That's fair. :)

[instakill]

I stand corrected.