Rey is a Skywalker (sorta)
Some fans immediately pointed to Rey as being the daughter of Luke. There is no real meat to this theory except that Anakin is the main character of the prequel trilogy and Luke is the hero of the original trilogy so it would fit that another Skywalker is the hero of the new trilogy. Insert Rey. Others will say that Rey is the daughter of Leia and Han Solo making the story still about the Skywalkers, sorta. This would mean that Kylo (Ben Solo) and Rey are siblings and would justify the connection the two seem to share in ‘The Force Awakens’. And if Ben fell to the Dark side that might lead Han and Leia to take their other Force sensitive child and hide her from both Kylo and Snoke. Plus the sibling angle could be influenced by some Legends material.