Nishikori is officially out while Wawrinka and Dkokovic still seem very doubtful, Nadal seems guaranteed to play unless he has another issue although how sharp he will be is questionable.
Generally I don't care who wins the grand slams but the last two of last year on the men's side were so underwhelming, the women's events were good, due to the injuries and lack of high quality opposition for the eventual winners (the French was slightly different because although it was a procession at least Nadal had to beat some very good players). I really hope if Federer does win it then he is at least properly tested by some of the younger players stepping up, it's time for the likes of Dimitrov, Zverev and maybe even Kyrgios to get to a slam final this year.