What is the attitude of Poles in Poland towards their countrymen who were deported in the 40’s either by the Germans or the Soviets and who never made it back home but created a new life abroad?
It depends where they were deported. It's different in case of people from let's say Kazakhstan (who gets some aid from the government and sometimes help when they want to move to Poland - not enough maybe but still something) and those who made It to the west and lived (and still live) there much better than Poles in Poland.
Do they feel that there is a special bond still linking them, or are these foreign Poles simply foreigners who may know something more about the language and the history of Poland than the average foreigner?
Generally If people were deported or had to escape then It's different than those, who chose to leave but obviously It also depends on that person, who lives abroad - If someone claims to be "100% Polish" can't understand a simple sentence in Polish then It's quite funny.