We found two regressions. One on Active Record and one on Action Pack.
Took some time to fix those issues so the release was delayed until today.
Here are the changes from 4.0.1.rc3 to 4.0.1.rc4:
https://github.com/rails/rails/compare/v4.0.1.rc3…v4.0.1.rc4
And the changes from 4.0.0 to 4.0.1:
https://github.com/rails/rails/compare/v4.0.0…v4.0.1.rc4
If we don’t hit any more stumbling blocks, I’ll release 4.0.1 on
Friday, November 1st.
Rafael Mendonça França http://twitter.com/rafaelfranca https://github.com/rafaelfranca