The most awaited Windows Live Essentials 2011 wave 4 Beta will be available to download today (24th June 2010) from the Microsoft website. This is not active yet but you can have a look here and download it when it is available
Currently am using a leaked build of Live Writer Wave 4, now. Which does not have much additional features, but the design is changes. It is having the ribbon interface now.
[Via The Techno Path]