Wizzair are certainly expanding rapidly and have just announced a new service between Bucharest and Dubai.
http://www.romania-insider.com/wizz-air-to-connect-bucharest-to-dubai-with-new-flight-this-fall/79038/
The airline is also studying the possibility of a route from Bucharest to Tel Aviv.
I just wish they would consider routes from Poland, ( e.g. Warsaw, Cracow) to Portugal, (at least Porto!)