Citrix placed the Web Interface 4.5 to the download section yesterday. If it's the same as I wrote an article about from the beta metaframe4.5 edition then you should be carefull. If your thinking about deploying it, and you run a customized web interface for example with add-ons from Thomas Koetzing or Jason Congor because the structure is totally different from 4.0 and 4.2

You can get the software here