I'm currently updating my image assets to comply with Apple's iPhone 6+ @3x dimensions. I'd like to use CC's image generator to do so but unfortunately it seems that it only exports up to 2x. Does anyone know if Adobe is working on an update to fix this? Also is there an automated workaround in the meantime? I also use the program, Slicy but they've yet to release an update.
The latest Photoshop update (Photoshop CC (2014.2) allows for @3x. Go to File > Extract Assets. A panel will appear with options:
More details can be found here: http://www.adobe.com/uk/products/photoshop/features.html
Try http://retinize.it/. 1x, 2x, 3x for the selected element + scaled 200% + scaled 300%. Perfect for iOS assets.