With regards to what council areas may or may not vote yes, I would suggest relative SNP strength is a pretty bad measure, a lot of their Westminster seats are won on the proviso that they're not the tories or labour.
I'd suggest poverty rates and unemployment as a better outlook. On this, I would suspect the vote in the Central belt to be far more pro yes than the rest of scotland. Even places like Edinburgh, which will probably go 'No' overall, will have a substantial, substantial yes vote, and I would expect the likes of North Lanarkshire, Falkirk and Clackmannan to go yes. Glasgow could go either way at this point so I won't make a prediction there. Also, Dundee will have the highest yes percentage in scotland, I'm fairly comfortable with that prediction at this point.
I think Glasgow is a yes, just how much of a yes might be the decider as it's one of the last places to call.