From what I've heard...
TLV (332), MOW (767), BHX (757)
I sure wish they'd run PHL-WAW. Scott says it's not really high up on their list right now.
I think PHL-WAW would work. Only airline flying nonstop from Poland is LOT. NO USA based carrier. PHL-WAW could be done on a 767. Set up code/share w/ LO in Warsaw. Pretty big Polish population in PA, connections in ORD/JFK/EWR to LO are a hassle, while PHL is much smoother and you stay inside security. the 18J 767 matches LO's config which has the same amount of seats. You really don't need more than that. In my opinion, a PHL-WAW service should come before PHL-MOW. MOW won't offer any onward connections, while WAW offers not only MOW, all of Poland and other Eastern Euro cities, but also TLV and Bahrain. LO isn't as good as LH or LX, but it's a 3 star airline like US. Plus WAW and KRK are beautiful, historic cities and tourism are growing year-over-year.
These are just my thoughts and way of reasoning. Please spare the attacks.
-Kinglobjaw