I wish I had a camera to take a picture of the sign. (I really should have one with me at all times.) It is a small thing, so small that I did not even notice it last week when I went downtown on the metro (and I am sure it had already been erased then).
As for Tahrir itself, it was still lively as there were still demonstrations taking place at various positions around the square. The largest congregation, I guess, may have been 1,000 people, and there were several smaller groups of perhaps a couple of hundred. There was a strike a couple of blocks off the square, at a bank building as well. There were army officers standing watch, but they did not appear to be positioned aggressively, but after Friday night, it seems like all bets are off.