Yes, this is happening in 2017. I was 10 when TOY STORY debuted in 1995.
I am unsure about trying to recapture the magic, which will be seven years after TOY STORY 3, which closed that phase of the adventures of Woody, Buzz and friends very well and also resolved their relationship with Andy.
Last time Disney took a shot at a part 4 was PIRATES OF THE CARIBBEAN: ON STRANGER TIDES, which well…. Happened.
Other part 4s include LETHAL WEAPON 4 was mild compared to its prior trilogy. FAST & FURIOUS in 2009 did well and now we have FURIOUS 7 dropping next spring.
I think Pixar will do something unique because it is Pixar. They have a stellar quality record. Even their weak links are stronger than many films.