3rd Winchester Bro?!?! :O 

personally i loved the idea because i love jake abel!!

well the episode is called 'jump the shark' :] so i'm hoping it's a possibility but then they find out that he isn't really a Winchester. [although he does look like one!]

even if he is ; Sam & Dean = the original Winchester brothers. end of story :] mwuhaha =D

I'm not very fond of that idea, but if they can make it interesting then go ahead, but the focus has to be on our Winchesters.
although I can imagine Sam and Dean telling him about their life: "Guess what, dude, both of us have been dead." - "Awesome!"

New Brothers and sisters are appearing in many TV shows, it seems to be the new resource to write new plots :D lol....I like the show and think Jensen and Jared have got an excellent chemistry to work together and you can see that on the screen.