Offline maps is not a new feature. In the previous version offline maps was available, too, in the labs section.
The only remarkable difference that I see in this version is, that it starts by boot automatically two processes of about 13 MB RAM. The previous version did not start anything until it was started itself.
This is why I will unintall this version and reinstall the previous.
EDIT: ok, now I notices that there is a difference between offline saving the maps in cache and saving it locally.