The Undertaker was able to walk off under his own power after losing to Brock Lesnar, but he did suffer some real injuries in the match.
According to f4wonline.com he was hospitlized with concussion and a neck injury suffered in the early part of his match with Lesnar. It didn’t change the outcome, because it was predetermined that Brock would win.
He was kept overnight, but appears he will be fine.
We will see what happens on RAW tonight.