• Mayim Bialik and Jim Parsons as Amy and Sheldon

Mayim Bialik and Jim Parsons as Amy and Sheldon (Photo : Twitter/TheBigBangTheory_CBS)

"The Big Bang Theory" season 9 is set to return to CBS in September and, as early as now, fans are already wondering what will happen to the relationships of Sheldon and Amy, Howard and Bernadette, and Leonard and Penny.

Fans are speculating whether or not Sheldon (Jim Parsons) and Amy (Mayim Bialik) will get back together or whether or not they would decide to end their relationship for good. According to Movie News Guide, there is a possibility that Amy will find a new love interest in the upcoming season now that she and Sheldon have broken up.

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On the other hand, show runner Steve Molaro said that there is a huge possibility Amy and Sheldon will end up together again because they are very fond of each other.

Another thing that fans want to know is whether or not Penny (Kaley Cuoco-Sweeting) and Leonard (Johnny Galecki) will continue with their plans to get married in Las Vegas, Master Herald reported.

During last season's finale episode, the couple headed to the state but it is unclear whether or not they sealed the deal at that time. 

Finally, little is known about Howard (Simon Helberg) and Bernadette's (Melissa Rauch) relationship. Some fans are speculating that the two could finally take their marriage to the next level by planning the latter's future pregnancy.

During last season's finale episode, the couple decided to evict Stuart (Kevin Sussman) from their family home, thus heightening the speculations that they indeed want to have more private time together.