This is the first release of ScintillaNET based off the 2.0 branch. The entire API has been re-written and is not compatible with 1x versions. All built in features of Scintilla are completely implemented with both a Scintilla like API (INativeScintilla) and an abstracted API that hides much of the flat API nature of Scintilla (Scintilla control). Many common things that were difficult to do with ScintillaNET 1x are now made easier with the new API. Also many new features that are not inherent with by Scintilla have been added. These include Print Preview, Find and Replace dialogs (with full regular expression support!), GoTo line dialog, document navigation, drop markers (like CodeRush), (Visual Studio-like) Code Snippets.
The majority of Scintilla's properties can be designed using the Windows Forms designer property grid. This is probably the easiest way to get started with many of the features, as you get immediate feedback of changes.
Lastly a brand new configuration system has been created. It uses a multiple layered configuration approach that is both very powerful and very easy to get started with.
Documentation is still non-existent. I promise it will start trickling in. For now the best way to learn is to open up the SCide example project and see what it does.
Read the readme.txt included in both downloads for instructions on how to get started in setting up your development environment.