The signage has been up for ~week or two... since the fencing was taken down for the work on the walk along the shore of the lake. If you look around up and down the LFT by LSD crosswalks, there are signs pointing pedestrians towards the separate walk along the lake for pedestrians. The signage appears to suffer from not being too terribly obvious unless you're looking for it.
Thanks - I thought it was a bit funny as I had just passed through a giant group of fountain-gawking tourists. That's not unusual or a big deal, it's just a bit funny to think people can be this finely refined in terms of their behavior. I am guessing this may pertain to the whole Griffin donation for separated trails?