On my downloads area there is a premium module that works with Newsletter 3.0. This module will be free only until the official release of Newsletter 3.0.
Newsletter Updates sends emails automatically to targeted subscribers with a chosen theme.The default theme can be configured to check for new content on specific blog categories.
Emails can be scheduled daily, weekly, or on specific days.
It is a normal plugin to be installed as every other plugin but adds an entry on “automated emails” Newsletter plugin menu.