Nothing concrete, but there probably will be another https://www.space.com/42808-nasa-new-horizons-possible-third...
"And we hope to hunt down one more KBO — one more Kuiper Belt object — and make an even more distant flyby in the 2020s," Stern added [...] New Horizons [...] has enough juice [...] to keep the power on through the mid to late 2030s, he said.”