Source: Sapphire Steel
Amethyst will be available in two editions:
Amethyst Personal Edition (Free)
Amethyst Personal is a free Flex/AIR IDE  which will provide a project management, editing, building and launching environment for Flex/AIR/ActionScript. This will be completely free and may optionally be installed into the free Visual Studio ‘shell’ edition.
Amethyst Professional (Commercial)
Amethyst Professional will provide a drag+drop visual design environment for Flex and AIR. The visual designer will integrate with Visual Studio’s Toolbox, Property panels and code editor to provide a seamless design-and-code experience which will be familiar to C# and VB developers.
Amethyst Professional will also include full IntelliSense capabilities including code completion, code navigation and auto-expanding snippets. Amethyst Professional will provide IntelliSense both derived from pre-compiled libraries and ‘on-the-fly’ by analysing code as it is written. It will have a powerful integrated debugger to allow you to step through your code, drill-down and examine variables in a similar way to the debugger in other Visual Studio languages.
Amethyst builds upon SapphireSteel Software’s expertise in the creation of the Visual Studio Ruby on Rails IDE, Ruby In Steel. While Amethyst is not specifically targeted at Ruby developers, Amethyst projects will optionally integrate with Ruby In Steel projects to provide the ability to create Flex and AIR applications for Ruby on Rails (as well as other Visual Studio supported technologies such as C# and ASP).
Amethyst Personal (beta) will be available from this site in the 2nd week of December 2008.
Amethyst Professional will be released in beta in the first quarter of 2009 and the final version is expected to ship in the 2nd quarter.