Just a few thoughts...
a) Prem goes, har rishta peecha choot jaata hai, par yeh taarein, har manzir par aapke saath hote hai... heer looks back and runs into prem signifying that heer and prem are going to be there for each other, with each other always...This can also be viewed by the fact when they are walking, each step of theirs perfectly in sync with each other....
b) When prem mentions biwi and heer has a flashback of her mom telling her that the stars were dressed as a bride when you were born.... does this mean we shall see a prem-heer wedding soon
c) and then when prem and heer do hug, no shyness, no pretence, a tight embrace... and the tune of mohabattein plays , thus signifying that love will win , it brings me back to what jugnooo says that the world will have to bow infront of their love and accept it...
d) Tootega.... jab bhi tum dua maangoge, tab yeh taara zaroor tootega, tumharee murad puree karne...and the taara breaks...meaning alls well that ends well.... it also brings me what ws mentioned in om shanti om that agar ant accha nahin hai, to matlab avhi uska ant nahin hua, picture abhi baaki hai dostonš