I don't exactly know whether new routes will be coming or not - but my guess at this stage would be 69 and 87.
Regarding night routes, 524 is the longest, with a full circle (that is, terminus A to terminus B and back to A) of 75.93km. The reason for its length is that not only it goes to Police, a town about 13-15km to the north of the stop Komuny Paryskiej, but it also crosses the town down to Pomorzany. Then you've got 522 at 60.18km (again, a full circle), 526 at 48.31km, 529 at 46.07km. All the other are shoerter. Night routes in Szczecin are a tad longer, I agree, because they serve much more areas at a less number of routes.
Having said that the Police route, 524 (btw, Police is pronounced "poh-lee-tzeh"
By the way - night routes' scheme >> http://zditm.szczecin.pl/schematy/nocne.html . 522 is light blue, 524 is pink. Day routes can be seen here >> http://zditm.szczecin.pl/schematy/dzienne.html >> and this may also explain 73 to you in some way
Oh, and last of all - Warszewo terminus at night >> http://foto.mkm.szczecin.pl/big/2007/1179037183.jpg . Believe it or not, 522 is operated by neither SPAK, SPAD nor SPPK - but by the PKS. PKS are local bus companies that organised (and some still do, but in a somewhat destructive manner
Krucza Dom Kombatanta at night >> http://foto.mkm.szczecin.pl/big/2008/1201461330.jpg >> and Krucza St. at day >> http://foto.mkm.szczecin.pl/big/2007/1182025281.jpg .
Wiszesława >> http://foto.mkm.szczecin.pl/big/2007/1188396839.jpg >> and >> http://foto.mkm.szczecin.pl/big/2007/1187623628.jpg .
And the last thing - FYI, I'm not from Szczecin (which can be seen to the left) and I've never actually been there.
Uff. That's long...