Apple today released OS X Mavericks Developer Preview 7 and included were these beautiful Mavericks Wallpapers. These are all retina. The new wallpapers depict various landscapes and nature images. The Mavericks wallpapers have a resolution of 5120 × 2880, could this point to a future Retina iMac?
To Download the images; click on the image you want then once loaded Right Click > Save Image As.