While we don’t expect we’ll get all of our answers in Star Wars: The Last Jedi, as they’ll surely leave some things for Star Wars: Episode IX, we do look forward to learning more about Rey.
Star Wars: The Last Jedi will be out this December, which won’t be nearly soon enough for us.
At the same time, it appears that if we do go “deeper into Rey’s story” we will be getting some sort of answers, either from Luke or elsewhere.