We already know that Brock Lesnar and Goldberg will be competing in the match. This is ultimately being done as a means of generating interest in the novelty of seeing these two in the match and whether you're into the program or not, it'll almost certainly work out the way WWE wants it to. Neither guy has much of a chance of winning as this match is mostly a prelude to setting up a rematch for them at WrestleMania XXXIII. One may well eliminate the other one with said other one, out of frustration, re-entering the ring to eliminate his arch rival, thereby, possibly, leading to some big brawl between them at ringside. As to who actually wins the Rumble, it seems fairly open this year though there are some favorites. John Cena is a favorite as many expect him to win, challenge AJ Styles at WrestleMania and ultimately capture his 16th World Championship. Another name that's gotten some speculation is the debut of Samoa Joe in which he's one of the surprise entrants; he wins the match and challenges Styles for the WWE Championship for WrestleMania or he winds up coming after Kevin Owens and the Universal Championship. Another potential favorite is the Undertaker in which he also challenges Styles for the WWE Championship. At any rate, I think there's been more interest in this RR match than in the past few years, at least among a lot of internet fans, as Roman Reigns doesn't appear to be occupying as prominent of a spot as he has in previous years.