CodeGear has given me permission to blog about the upcoming release of Tiburon.
Here's a small but welcome change. Recent versions of Delphi required the full .Net SDK, at least partly for the help system, and this takes up quite a lot of space. Delphi 2009 doesn't need all of this and just installs the latest version of the Microsoft Document Explorer (or version 8 for Win2K). For the sake of clarity, Delphi 2009 still requires the .Net runtime.
Of course, you can also expect other help improvements, including more content (new classes, components and properties) and improved indexing.