There's no word as yet. The 2015 season will see four and a half manufacturers compete (Ford give their blessing for M-Sport to use the Fiesta RS, but don't support the team financially), which makes a calendar expansion a much more viable prospect since the sport is no longer dependent upon privateer teams to sustain entry lists. The calendar could probably support sixteen rounds, which hasn't happened since the 1990s.
However, if rounds were to be dropped, Argentina and Sardegna are the most likely candidates. Argentina was put on notice last year after serious safety issues, and their presence from 2017 hinges on this year's event. The FIA has already forced the organisers to change the 2016 route, since they wanted to use roads featured in the Dakar Rally, but the FIA felt that the average stage speed would be too high to be safe; it's currently capped at around 130km/h. It hasn't helped that Argentina was pushing for an endurance format, which had the backing of Jean Todt, but has fallen out of favour with promoters; Mexico ran the 80km El Chocolate stage this year, but found that it was impractical at best.
Otherwise, Sardegna is perpetually under threat. It has suffered funding problems and a low spectator turnout for a while now, and seems to have survived more by luck than by design; there was a push to expand the calendar a few years ago, with events touted in Brazil, Russia, China and South Africa; China got the nod, but while the FIA wanted a second round, the Russians lost interest, while South Africa and Brazil never got past the candidature stage. Sardegna survived by default. And unlike the perpetually-unpopular Alsace event - which was only really run because it was Sebastién Loeb's home event - there is no alternative like Corsica; there appears to be no real desire to go back to Sanremo. Short of finding a new event in Sicily or southern Italy, the rally seems to be stuck where it is, and given its problems, it's a prime candidate for replacement.