Just thought maybe the tying up of loose ends is the Johnny/Jake/Danny scenario plus the storyline of Phil's revenge on Johnny which is currently running. Danny comes back, and Johnny being in the state he is at the mo, prob an even worse one by then, thanks to Phil, kills Danny in a fit of rage. Maybe there will be a final confrontation with the three of them Jake/Danny and Johnny and poor Jakey witnesses another murder this time that of his brother, attacks Johnny, grabs the gun from him and shoots him, or there is a struggle and the gun goes off followed by the duff..duff and we're left in suspenders until Monday! All of this of course will be witnessed by Phil..
Another possibility which could tie in with Jakey killing Danny, Danny goes to shoot Johnny and Jake tries to grab the gun from him, there's a struggle the gun goes off, then the duff..duff..