Original sentence: Expression Blend 3 Preview is available March 18, 2009.SketchFlow is not included in the preview, but expected to be in the release version
Edited sentence: A first Expression Blend 3 Preview was available March 18, 2009.A second trial release on July 10, 2009 included SketchFlow.It did not include SketchFlow, but announced to be in the release version.Sketchflow is a module for quick sketching and prototyping in Blend