Joe could also die as he is leaving soon.
The new students are all there in the pub so maybe one of them dies.
Jake and steph are upstairs in the flat above so maybe one of them

there are 3 definate possibilities who could die.

~Sam
~Mel
~Sophie - Pictures of reaths in ealier soap mags have the letter "i" in it (Although this could be olivia)

the actress who plays lousie said in an interview that she looses a few friends in the explosion and spent her recent scenes crying!