Are you guys checking the R2S website ? You should the creator has been posting updates quite regularly the past week.
Major things :
Rivalries in Hip-Hop/Rap => possibility to release diss track : +sales/hype if successful / backslash if not (he shows a screenshot of Iggy vs Azealia

)
Relationships between artists (romantic relationships confirmed but not details yet), writers, producers which will make the artist more likely to work with the writers/producers
Genre change => You request the change to the artist which they can refuse (he has a screenshot of JB refusing to go "Dance", you can only change once every two year)
Holidays, different types of holidays ranging from 1-3 weeks and vary in price (remember that artist can go in hiatus if they're overworked so this might be helpful to prevent long hiatus requested by artists)
Artist stats : Live, Recording, Ability, Dancing, Learning, Responsibility, Rebelliousness, Professionalism, Patience, Creativity, Fashion Egotism, Greed, Tour Practice, Charisma, Adaptability, Visual, Writing, Production, Confidence (

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Grow artist abilities (Music writing, dancing lessons, music production, confidence training, coaching from stylist, learn to play an instrument)
You can gift things to your artist to improve their morals => Car, house, jewelry (kinda useless but why not)
Release types : Singles, EP (they don't chart, that's BS but ok), Albums, Greatest Hits (still allows a few new songs for the GH albums)
Soundtracks : when a movie is made a soundtrack is commissioned, its commissioned based off of a genre selected and a pool of artists that are selected to take part in the release. The type of artist and level in terms of rep is based off of how good the movie is. A label is nominated to produce the album and will profit it from it, however the costs will be taken on by the studio. Artists are paid a straight fee for their work but no other royalties, unless they wrote their song too and then they will get writers credits as well. (THIS IS AWESOME)