These are some facts that J.K.Rowling let slip in numerous interviews 

~ Azkaban no longer uses Dementors as guardians.

~George Weasley married Angelina Johnson and had 2 children named Fred and Roxanne.

~Harry made sure that the Wizarding world knew that Snape was a hero and on Dumbledore’s side.

~Slytherin House became more diluted and was no longer solely pureblood; however its dark reputation lingers.

~Harry lost the ability to speak Parseltongue.

~Umbridge was arrested, interrogated and imprisoned for crimes against Muggleborns.

~The Resurrection Stone is now buried in the Forbidden Forest after being pressed into the ground by a centaur’s hoof.

~ Voldemort’s curse on the DADA position at Hogwarts has been lifted.

~Viktor Krum fell in love with a woman back home in Bulgaria.

~The Death Eater’s Dark Marks eventually faded to look like a scar. It will no longer burn or hurt.

~ The Quibbler is back to publishing articles about the lunatic fringe & is appreciated for its unintentional humour.

~Members of the DA still have their coins, as they are like badges of honor.

~Neville Longbottom worked as an Auror before moving on as the Herbology professor at Hogwarts.

~The remaining Death Eaters were killed or imprisoned in Azkaban for their crimes, with the exception of the Malfoys.

~Luna Lovegood married the grandson of the Newt Scamander, author of ‘Fantastic Beasts and Where to Find Them’

~Firenze survived his wounds and was welcomed back into the Centaur herd.

~Harry will never become Headmaster of Hogwarts since an academic career just isn’t him.

~Hagrid was still working at Hogwarts by 2017, at 88 years old.

~Draco Malfoy really cares about his son, Scorpius Malfoy. He is growing him up to be a better person than he was.

~Centaurs realized that “pro-human leanings were not shameful.

~Draco and Harry never became friends, but they did come to understand and appreciate each other better.

~Hermione tells Scrimgeour that she is not planning to embark on a career in Magical Law. Ironically, that’s where she ends up.

~After his death, Voldemort is forced to exist in the stunted infant-like form that Harry sees in the King’s Cross-like Limbo.

~Harry would take his family to visit Dudley’s when they were in the neighbourhood (occasions dreaded by James, Albus and Lily).

~Aberforth is still at the Hog’s Head “playing with his goats”.

~The number of Dementors have been greatly diminished because despair and degradation have been lessened in the world.

~Arthur Weasley fixed Sirius’ motorbike and gave it to Harry.

~Nineteen years after the Battle of Hogwarts, the school for witchcraft and wizardry is led by an entirely new headmaster (“McGonagall was really getting on a bit”) as well as a new Defense Against the Dark Arts teacher. That position is now as safe as the other teaching posts at Hogwarts, since Voldemort’s death broke the jinx that kept a Defense Against the Dark Arts professor from remaining for more than a year.

~Hagrid never married, although he had a relationship with a giantess.

~Kingsley Shacklebolt became the Minister of Magic after the Second Wizarding War.

~Harry will not train to be an animagus; his “energies are going to be concentrated elsewhere and he’s not going to have time to do that.

~Audrey Weasley is wife of Percy Weasley, and they both have 2 daughters, Molly and Lucy.

~In the aftermath of the war, the Order was disbanded once and for all.

~Luna has twin boys named Lorcan and Lysander with Rolf Scamander.and apparently travels the world, looking for mad creatures.

~Hermione advanced the rights of magical creatures & eradicated the old pro-pure-blood laws in the Department of Magical Law Enforcement.

~The head of the Auror Office as of 2007 is Harry Potter.

~Lavender Brown was attacked by Fenrir Greyback. Hermione saved her but she was already injured. What happened to her later on was never really told.

~Neville Longbottom’s students were impressed when he showed them his Dumbledore’s Army’s Coin.

~Harry, Ron and Neville didn’t return to Hogwarts for their 7th year. They went straight to get training as aurors and Neville went to work as an auror before becoming a Professor.

~Harry sometimes visits Hogwarts to give talks on DADA.

~Hermione is James’ godmother.

~Hermione Granger was the only member of the trio who returned to Hogwarts to complete their seventh year.

~Ron worked with George in WWW for some time and then became an Auror.

~Ginny became a professional Quidditch player for the Holyhead Harpies and become the senior Quidditch correspondent for the Daily Prophet.

~After the war, Hermione found her parents in Australia and restored their memories.