I translated these myself from a german website:
Vajda: "I noticed that Novak needs a new coach, to advance his game in certain areas." The Slovakian will stay as a permanent coach in Djokovics team. However he will be taking care of his 2 daughters more, who are also playing Tennis.
Becker: "I am proud that Novak asked me to be his coach. I will do my best to help him to achieve his goals. And I am convinced that we can achieve great things together."
Djokovic: "I am totally stoked to have the opportunity to work with Boris. He is a true legend."
Also says that Becker will be there for the following tournaments: The 4 Grand Slams, Dubai, Miami, Monte Carlo, Rome, Cincinnati, Shanghai, Paris and London. Djokovic on that: "These tournaments are the most important in our sport, and that's where I want to prove myself."
Source for all of it: http://sport.orf.at/stories/2197788/2197789/