I made this nice layered PSD guide image showing all the different screen ratios and resolutions. Useful when designing your game or interface to see what areas people will see on different devices.
There is a downloadable 2560x1600 PSD file too, get it from my blog here: http://www.gmtdev.com/blog/2014/08/31/visual-guide-to-on-screen-safe-areas-multi-resolution-support-template/
This is of course assuming you are filling the screen by showing more of your games map to fill boarders. If you are stretching your design area this probably isn’t useful.
Also refer to: http://www.cocos2d-x.org/wiki/Multi_resolution_support