As for a rematch between Benfica and Sporting in the final it's definitely looking like a strong possibility. They've been so dominant it's hard to see anyone else really challenging them consistently. But football's a funny game you never know when a games turn against the underdogs and sometimes matches don't really go as expected.
The chances of these two teams meeting in the final are indeed strong, at least for the past two seasons both teams have had strong dominance in the league. The competition in this league isn't quite as tight, unlike what we see in PL & Serie A. Apart from Sporting & Benfica, there are only 2 other good contenders, those are Porto & Braga. Hopefully the other two teams can perform well in the upcoming season.