Rob Eagle, Aradhna Tripati, and colleagues have just published a paper in Nature Communications wherein they compared measurements of isotope clumping in modern and Cretaceous dinosaur eggshells to show that "variable thermoregulation likely existed among the non-avian dinosaurs and that not all dinosaurs had body temperatures in the range of that seen in modern birds".
UCLA Newroom Link: http://newsroom.ucla.edu/releases/measurements-of-dinosaur-body-temperatures-shed-new-light-on-150-year-debate