Things that will be excluded for the first release of Thunar.
Maybe for a version 2.0. The first-time code should consistently use URIs (libexo has already ExoUri, although its probably not the perfect implementation), so that at a later time its still possible to add remote file system support.
Version 1.0 should not feature any complex plugin system (at best, no plugin system at all). This includes inline editors, web browsers, full window previews, and the like.