Can that whole schedule be published? 
11th of April - 17th: Multisig
18th - 24th: Client for hardcore users (I don't like bells and whistles that eat 100% of CPU)
25th - 30th: Testing of the whole Iota functionality
1st of May: Holiday
2nd of May: Release of beta version
This is my personal schedule that is not coordinated with the Foundation that (maybe) planned Grand opening with fireworks and barely dressed girls serving cocktails.
Thank David and CfB. Question regarding Beta: Will this Beta than be able to have safe transactions (without the likelihood of rollbacks) or will this come with a final release later?
As long as it's still considered beta the rollback is always a possibility. However if a lot of people conduct testing the beta period will not last long, so full launch will be right afterwards.