Im with the guys saying Dina is the antagonist. She may not even be the primary antagonist, but she's got to be the enemy. In the recent gameplay, Ellie sarcastically asks Dina if she knows how she'll die. Dina sarcastically remarks that yes, Ellie will kill her. That was foreshadowing, albeit tongue in cheek. It's got to be Joel she's avenging. Not only narratively, but for the players investment.
The big theme has been repeatedly touted as revenge. If you played the OG, you're not going to care about Dina like you would Joel. The savage killing sprees wouldn't be nearly as cathartic and personal if it was all over a character you've known for roughly all of 45 minutes. I think Joel dies, and I think he dies in brutal fashion. I fully expect ND to gut punch everyone. The first half of 2020 is loaded.
Everybody is on the Joel Trojan horse..
Tommy and his wife are the prime suspects to die for me..
It is a strained relationship between both Joel/Ellie..
Druckman and Gross have said in the two interviews posted..
That Joel comes in after the horrific event that causes Ellie to wild out..
And his role is huge..
Just like Anna/mystery woman..
Even in the first trailer..
It’s alluded to her relationship with Joel being kind of strained..
Dina is probably three things..
A sleeper cell for WLF or FEDRA..
Marlene’s daughter(like someone mentioned on reddit)
David’s surrogate daughter(my long shot theory)
Tommy and Maria have probably had a serious impact with Joel not around..
So I can see Jackson being attacked and destroyed..
Another father like figure and mother killed in front of her..
I’m of the belief that this is an eye for an eye type revenge story..
I think this is a two sided(possibly three whenever we find out who Anna is)story..
I think they are just misguiding us on just Ellie and not the other characters that could have hateful/vengeful spirits..
Not only towards Ellie/Joel..
But to other new characters in the story..
Also something interesting(I think I’m going to start another play through next weekend) mentioned on reddit..
The Cult was slightly mentioned when you are walking with Tess to the first mission..
I don’t remember the dialogue but if true..
Then this cult has been around about the same time as the fire flies(which according to both director and head writer)..
There are still remnants of..
Again..
This is not a post to call you out or shyt on you..
Because all theories, thoughts and ideas are never wrong..
Until hardcore evidence is provided
Just another way of looking at it

Edit..
And I know Tommy’s speech..
But we don’t know the sequence of that or if it’s even in the final build..
Also just another theory I have..
Dina’s bracelet is not a sign of heartbreak..
More of a sign like..
“Remember who did this to you”
“Remember who recked your whole shyt and left you for dead”..
“Let that be your motivation just like *insert something from 1* that has driven me mad for years”..