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The terminus point has been moved to Bristol Parkway, however it continues to Bradley Stoke afterwards and does a 1 way-loop around Bradley Stoke North, and then back to Bristol Parkway before continuing to Whitchurch, if that makes sense. How would people know that the 73 still serves Bradley...
So it seems the new no. 5 will take the same route as the 8 to Christ Church from the City Centre, and then it turns around. Essentially a curtailed version of the 8.
Muller Road Top just sounds like an odd place to terminate, especially when Southmead Hospital isn't far away. Oh well, we'll just have to wait for more details. If it's not circular then that would be pretty lame.
I strongly suspect the 77 is circular, and completes the loop via Southmead Hospital.
From what I heard, it sounds like the 36 is merging with the 8 to create effectively a "new" 5 service.
This is just speculation, but I think the 8 might be rerouted through Redland via the old 9 route.