#1 Planting the seeds

The match that the fans were waiting to see for many years might come to fruition this year as the seeds for the highly anticipated match between John Cena and The Undertaker may be planted at the 25th anniversary of Raw.
Both superstars have been advertised to be present in the show and this could open the door for a potential match between the two legendary superstars at the Show of Shows. John Cena himself said that he would like to face The Undertaker at WrestleMania while cutting a promo against The Miz last year.
He even went far enough to call The Undertaker an old man with a broken hip while addressing Roman Reigns before their match at No Mercy. This might be the best reason to have The Undertaker confront Cena next week and potentially challenge him to a match at The Grandest Stage of Them All.
It seemed like we had seen the last of The Undertaker after his defeat at the hands of Roman Reigns last year. If he had indeed retired, we might have seen him inducted into the hall of fame. But it was reported that Goldberg will be the first inductee into the WWE Hall of Fame this year and will likely be the head inductee of the class of 2018.
This clearly shows us that The Undertaker has not retired and will have one last match against John Cena at Wrestlemania 34 in New Orleans. So, we can expect the two superstars to cross paths at the 25th anniversary show of Raw.