Yes, he said the following in his pre-tournament press conference:
Q. Next year the grass court season will be a week longer. How do you think it will change your preparation? Personally, how long would you like the grass court season to be in the future?
NOVAK DJOKOVIC: I support that decision and the schedule change because it allows the players who get further in the Roland Garros tournament to have more practice days on the grass and then play a lead‑up event to Wimbledon.
I think it's very important.
I haven't played neither Queen's nor Halle for the last three, four years I think.
It's always better to get a few matches under your belt before you get to Wimbledon, a Grand Slam, on the grass courts, which is totally the opposite of clay courts, the surface on which you have played for two and a half months.
So from the slowest to the fastest surface, it takes quite a few days and weeks to adjust the movement. I think the movement is crucial basically because on clay you can slide, and here you can't afford too many big steps. You have to try to have as many of the adjustment steps and be balanced. The ball bounces low, where on the clay it bounces very high.
So all these different factors affect your adjustment, your game. So I'm looking forward to actually having an extra week where I would be happy to also play in Queen's or Halle and have more days to practice on grass.
So he prefers to have some match practice on grass, but winning Wimbledon without playing an ATP event before in 2011 seemed to make him realise that with the current calendar taking a few days off after the clay season at least doesn't hurt him.