It does not, you can actually pull in a gem[1] to use attr_accessible just fine with Rails 4. If you want to transition to strong_parameters, you can include the gem in your Rails 3 project and begin migrating to it, though that's a tough sell on most Rails codebases I've seen as it requires you to update every action in your app.
I have not personally migrated any of my code to Rails 4 from 3.2 yet but the transition will be far smoother than 2.3->3 was.
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It does not, you can actually pull in a gem[1] to use attr_accessible just fine with Rails 4. If you want to transition to strong_parameters, you can include the gem in your Rails 3 project and begin migrating to it, though that's a tough sell on most Rails codebases I've seen as it requires you to update every action in your app.
I have not personally migrated any of my code to Rails 4 from 3.2 yet but the transition will be far smoother than 2.3->3 was.
[1] - https://github.com/rails/protected_attributes