I've seen the film once and I'm not convinced that Han is dead.
Han falls off the platform, Chewie shoots Ren and then runs off somewhere. Chewie then later arrives with the Falcon to pick up Rey and injured Finn.
Who was taken out of the Falcon at the end while somebody says "he's still alive" or something similar? I know we are supposed to think its Finn but as far as I recall he's lying at a weird angle and you don't see his face or his body really as there are a lot of people in the way.
The only reason for not seeing his face would be because its Han.
I might be wrong and Finn could have been shown and I missed it. I will be paying close attention next time I watch the film.
Harrison Ford is also confirmed as returning in Episode VIII......