We don't have much information about WWE 2K16 yet but 2K has told us that it will feature the largest roster in WWE games history. A lot of people were suspicious of this and with good reason. In previous WWE games there would be duplicates of characters in the game.
For instance, in WWE 2K15 you would have something like CM Punk '11, CM Punk '13 and Alberto Del Rio '11 and Alberto Del Rio '12. You would also get things like Hunter Hearst Helmsley, Attitude Era HHH and modern day Triple H as three separate characters. According to 2K, this years game will not be the case as they are not counting the duplicate characters. Here is a quote from WWE2kdev's official Instagram page.
wwe2kdevFor anyone doubting the ”largest roster ever” tag line for WWE 2k16, let us assure you, that we are bringing over 120 unique playable Superstars and Divas to the game. Now when we say unique, we’re not counting the repeats like 5 John Cena models, or 8 Mark Henry models. As you can imagine, these models are keeping us crazy busy, but it is worth it. #wwe2k16largestrostereve
Pretty exciting! So here is my speculation as to who will make the roster this year
1. Most of the current active roster. I think this is finally the year where most of the WWE roster will make the cut. From John Cena and Seth Rollins to Zack Ryder and Heath Slater.
2. Most of the current divas roster. This shouldn't be too hard as there are what? Six divas on the roster now? Diva fans always complain that WWE games feature a huge roster of male superstars but always leave out tons of the divas. I think this may finally be the game where we get the big diva roster. I hope some diva legends like Trish Stratus and Lita make a return as well
3. NXT. NXT is in my opinion the best weekly wrestling show today and NXT is becoming huge. Last year Neville, Bo Dallas, Sami Zyan and Corey Graves made their WWE 2K debut. This year it has been confirmed that both Finn Balor and Sasha Banks would be included in the game and I am thinking that most of the NXT roster will be included this year as well.
4. WWE/WCW/ECW Legends. Legends are also a huge part of WWE games every year and I can see them going into the vault and putting a huge selection of legends in the game. From Stone Cold Steve Austin, The Rock, Kevin Nash, Hulk Hogan, Scott Hall, Ted DiBiase, and more, this may be the best roster of legends ever and we could finally have that "Legends of WrestleMania" game that we deserve.