A new interface is being prepared for deployment on the website soon. It will dynamically load scriptaculous, so that the page will appear to load as quickly as it does now while still being able to take advantage of fancy javascript rendering effects. The status bar will be improved along with overall layout, and a search bar will be added. A preview of the new UI is available here (this version is not up-to-date, it is simply meant to give the viewer a feel for what will change).
On an unrelated note, Mozilla released a release candidate for Firefox 3.5 yesterday, which has significant HTML 5 support. No browser can claim to have full HTML 5 support for a while, since W3C says that HTML 5 will not be finalized until at least two major browsers have support for it.
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