Bobby Lashley, Dean Ambrose, Drew McIntyre, Elias

Simply because of his physical appearance and his placement on the Raw roster, expect Bobby Lashley to have a big run in the match. Vince loves him, and his current feud with Seth Rollins means he's sticking around in the main event scene.
He might even make a final four appearance and could set up a potential Wrestlemania program with whomever he eliminates or whomever eliminates him.
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Dean Ambrose holds the Intercontinental Title, but will always be one of the more anticipated superstars to enter the match. He's a main-event player and one of the top heels on Raw at the moment.
Like Lashley, he should have a good run in the match and will probably be in it for a long time if he isn't defending the title earlier on the card.
Drew McIntyre will either be challenging for the gold at Wrestlemania or right after it, depending on who is holding the Universal Championship.
He's one of the true favorites to win the match, and if we go by how he's been booked on Raw, he's one of the top three threats to win the match along with Seth Rollins and John Cena.
Elias has been holding his own lately as a face for the first time in his main roster career. He routinely gets one of the loudest reactions from the crowd and might be one of the key wrestlers to build around in the future.