As far as I'm concerned there are only 2 players left and they happen to be the the only 2 real characters.
Shane and Danielle are non-entities and Jenn is a non-Jenntity. (Jenn isn't exactly blessed with good looks but what she does have, she sure makes the least of!)
It would be a shame for such forgettable people to win so I'm backing Ian and Dan.
Hoping Ian wins as I can't stand cocky, shouty Dan.

What exactly is the deal with the jury business? What happens there and does the public pick the winner at the end?

The jury picks the winner. They basically vote for their winner so having friends on the jury is a good thing. They will also consider how good a player the housemate is and things like how much they need the money.

I think Dan has to win. He has played this game to the hilt and this simply has to be rewarded IMO. It's what US BB is all about.

ETA The game plays until there are 2 left and the jury decide between those 2. Each evictee since Brittany will go to the Jury House.

Since Ashley. She was the first member of the Jury.

In a likely Dan vs? situation:
Ashley would vote for Dan i think, as would Joe, Britney and Frank im not sure about. It would be a travesty if they voted personally.

But in addition there is the real winner and the fan favourite voted by the public they usually win about $25,000.

The final 2 aren't eligible to win that, but every other houseguest is. I think the winner of fan favourite will be Ian or Dan unless they're the final two together - Then Britney will get it. I think theres an outside chance of Janelle getting it - she'd take it easily if she'd stayed longer.

Hasn't it only been America's Favourite Juror the last few seasons? Ian will get it for sure if he isn't in the Final 2, if not then Britney will.

It hasn't been favourite Juror since BB10.