Google pushed a new feature-rich Google Apps Script;
- UiApp is now available to all users! and allows you to build user interfaces, giving scripts ability to show a friendly interface, which's a necessity for less technical users. documentation
- ScriptProperties and UserProperties features allow scripts to store key:value data per user, or per script. ScriptProperties are a great place to store passwords and other script-specific information. UserProperties are useful for storing things like user preferences. documentation
- Apps Script editor is updated with bunch of features: Find & Replace, Script revisions, ability to change timezone of a script.
More Info: Release Notes