And for those who need to go further than Escher Wyss Platz the 17 now effectively replaces the 4 on the route to Werdhölzli. However the 17 only starts at Bahnhofplatz HB, so you'll need to change at Bahnhofquai HB, or at any stop up to and including Escher Wyss Platz.
Also the new tram network map is available in PDF form
here