The second GWT 1.5 milestone release is now available for download. New to this release:

• New DOM API package. Includes bindings for almost the entire DOM spec.
• Some GWT widgets like popups and trees now include animation effects.
• New Showcase example.
• Keyboard support improved.
• ARIA support for better accessibility.
• Built-in bi-directional layout support for widgets and panels.
• Long emulation that transparently maintains Java semantics for the long type in web mode.
• Single OS X distribution that supports both Leopard and Tiger.

You can read the full announcement here. Try out the new release and let the GWT developers know if you find any problems.