To answer your question. If you cried in the end of season 2, then yes you will cry in the end of season 4 too. You will both love and hate the end of season 4 but it will be two of the best episodes ever. You won´t only cry - there will also be a time when your heart jumps and you are really really happy :) And if you are like me then there will be moments all during season 4 where you are like "YAY" :)
I'm glad to hear this is pretty much the consensus.
Someone said the last two were one story but that I needed to watch all of the last 3 together. I asked why but was told it would be spoilery so I ditched my questions.
I'm excited to find out what all happens that's going to cause this kind of reaction. I may (cough cough) be sick tomorrow so I can knock it out.