In case anyone gets a wrong idea, take a close look at the title bar - it has the word "experimental" in it:

The reverse integration of the WPF branch is the first step in the direction of "more WPF" in SharpDevelop 4.0 (this screenshot shows the new WPF workbench and the new WPF start page).

So what does this mean for the not-yet released version 3.0? As 3.0 is the last version built entirely on top of Windows Forms, it will be a long-term stable release series - meaning there are plans for at least 3.1 and 3.2. We know a lot of people are using our workbench, our text editor and various other parts in their applications - and we are definitely going to be supporting you in the future!

Read the complete post at http://laputa.sharpdevelop.net/FirstMiradorSharpDevelop40Screenshot.aspx