You design at 1x, but need high-res artwork? One annotation, and Slicy magically enlarges your vectors and layer styles to build a high-quality 2x version. For 2x designs, it fills in missing 1x versions by scaling down.
I haven’t tested the feature myself, and as always I’d welcome hearing others’ thoughts about what’s successful and/or what Adobe apps themselves should change to better support this kind of work.
[Also, to preempt questions about Photoshop & other apps being revved to support Retina screens: sorry, I don’t have any new info. I will share more once details are available.]