They've only begun hinting at the game and the story is already garbage 
yeah this sounds awfull on so many level
- having sin back is the laziest plot hook they could come with and this is considering the plot of x-2 was like "here we have not-tidus who is sort of evil because of not-yuna"
- there is no way for auron to have a daughter considering that you know... unless babies in zanarkand work under magic rule which might actualy sounds plausible considering the whole "here's lulu pregnant but with no baby belly at all"
- here's tidus and yuna,no wait now it's just yuna,no wait now they are back,no wait now they aren't anymore... when did final fantasy turns into a cheap soap opera?