I assume you refer to this fragment?
That’s perhaps a bit misleading, what we meant is an example of tags that take parameters, like this:
#coloured(red)
just like you can do #importance(high)
. We didn’t mean that this would also actually change the color of the tag as it appears in Agenda. We don’t yet have an ETA for that.
Update: I’ve now also changed the example to prevent the confusion.