WorldEditor 1.5r3 is now the official WED build. This means you will need to use it to upload scenery to the Gateway, and you can now upload projects made throughout WED 1.5 beta testing to the Gateway.

WorldEditor 1.5 supports the new static parking and ATC features of X-Plane 10.50, and adds a visual taxi sign editor (shown below). WED can be downloaded here and has full release notes with the app.