JKR was asked about 'What would have happened if Tom Riddle had won in CoS?' She answered:

"I can't answer that fully until all 7 books are finished but it would have strengthened the present day Voldemort considerably".

We know something that HArry discovered in CoS is important to the last books.



What would have happened if Tom Riddle had been reborn?
Will we see Tom Riddle again?