How hard wil be the migration from CI 2.0 to 3.0

[eluser]alexwenzel[/eluser]
[quote author="Pert" date="1371558911"]
That's the beauty of CodeIgniter - from version to version it won't change that much, there are added features or feature enhancements and bugfixes, but the system itself should not completely change.[/quote]

True. I have read the changelog and detected exactly this. Not many changes but mostly buxfixes or small changes.