I just study the pic at Rolex Facebook page>>>>

[Jocke]

and I'm pretty sure it's a rotor weight made of gold.

http://www.watchwallpapers.com/rfb2015.jpg

So my guess is maybe there will be a glassback model this year.

[tela]

Maybe there will be a new Cellini collection.

[hugo]

No,Cellini was Last Year new.

[Perseus]

Thanks Joke