MindMup 2.0 now supports changing the look and feel of maps, including making connecting lines straight, which was one of the most requested features to migrate from 1.0. Unlike 1.0 straight lines, which were just screen candy, the new MindMup 2.0 visual themes are properly supported throughout the stack, including exports, collaboration and publishing to MindMup Atlas.
To set the visual theme, just select View->Map Theme in MindMup 2.0. To use it with Google Drive/Google Apps/Google Apps for Education, go to drive.mindmup.com. If you want to use this feature without Google Drive, go to app.mindmup.com.