Looks like the CC 2014 version of Photoshop added support for touch gestures (pinch zoom), but not touch painting. So, are there any alternatives to Photoshop that DO support touchscreen displays/the future? Besides MS Paint of course, which does 10-point touchscreen drawing just peachy-fine and is considerably less laggy than PS on large displays.
FYI the new touch gestures are hidden under experimental features, along with 200% UI scaling for 3200x1800 displays. From the release notes:
Photoshop now ships with the following experimental features that you can enable and try out:
Scale the UI 200% for high-density displays
Enable multitone 3D printing
Touch gestures
These features are not production-ready yet, so exercise discretion while using them. Do the following to enable an experimental feature:
Select Preferences > Experimental Features.
Select the experimental feature that you want to enable. For example, select Enable Multitone Printing.
Click OK.
Restart Photoshop.