Edited post added the official trailer. Added that reuploaded one because I found it before the official, but thanks for the link to the official video
Welcome back FabienWang. Yeah there's been a lot of changes and the community has been growing a lot. Not to long ago I seen about 5,400 players in MTA.
Could you please provide the source to this information?
Edit: Nevermind just found the source of the information you can see it on rockstars website http://www.rockstargames.com/
OK download the lastest resource package
http://code.google.com/p/mtasa-resources/downloads/detail?name=mtasa-1.1-resources-r800.zip
Now open the [editor] folder that comes in the resource package and replace the files in your resources with the files in [editor].
I actually find it quite easy to make guis without guieditor or QTToLua. But really I don't see a need for an official guieditor, if people would look around they could find what they need on here or on the community.