Of course – I will sit down at some point tonight and translate @derickfay’s TP2 → Keynote script into a TP3 version.
In the meanwhile, if you are running Yosemite onwards you can:
- Open OS X Script Editor,
- change the drop-down control at top left from AppleScript to "JavaScript*
- copy and paste the code from Script: move a @now or @next tag on to the next item
- (with a TP3 document open) click the Run button in Script Editor.