The wait is finally over. After two years of development, we already have with us version 2.8 of the most popular Image Editor of GNU / Linux: Gimp.
I was checking a few minutes ago on the website and they have not made an official announcement yet, however, you can download this new version from the Gimp FTP. In GimpUsers.com they have made an excellent post (In English) explaining the new features, which are not few. Between them?
- The long-awaited Single Window Mode option (although it is optional).
- Support for multiple columns.
- Editing text without the popup dialog with style options: D.
- Option to create Groups of Layers and the possibility of Mixing / Uniting them.
- Brushes can be rotated.
- Improvements in tools and their appearance.
- You can calculate the pixels [(200 + 20 + 20) * 2/3 = 173]: O.
- Image palette exportable to CSS, PHP, Java, Python or plain text.
- Tool windows can be customized.
- New keyboard shortcuts.
- New basic gradients available.
- The color curves show the RGB channels in the background.
- Support for JPEG2000 and RAW import in 16 bit.
- Integration with GEGL.
- Sliders (with the cursor) to set dimensions on tools.
- Screenshots of complete websites using Webkit.
- Option to export to PDF.
- Support for multiple pages in PDF.
- New tool: Cage Transform [Watch video].
- Improved support for Wacom graphics tablets.
- More, much more… 
Without a doubt, I think the wait has been worth it. Just looking at this extensive list of changes makes me want to try it out.
Source: @OMGUbuntu