I can't wait to see these 2 giants in the cage together. At the start I thought Carwin might be too much for Brock & end up KO'ing him. However the more I think about it the more I feel Lesnar will be too fast for Carwin & he is just as powerful.
Alot of people are underselling Lesnar's standup, the dude has fought 4 guys thus far & has dropped each of them with one punch. He was unable to finish Mir & Herring however in his first 2 bouts, but I believe he has learnt his lesson in that aspect.
I also feel alot of people are overselling Carwin's takedown defense, the dude was taken down in his first real test by Gonzaga.. fair enough Gonzaga is a Ju-Jitsu beast but he is hardly known for his superb takedowns. If Brock wants this fight to the ground badly enough I think he'll be able to get Carwin down if he wishes.. you don't manhandle an Olympic calibre wrestler & take him down if you don't have awesome wrestling ability.
Carwin has heavy hands, but technically he isn't an outstanding striker. Defensively he is weakest as Gonzaga showed when he rocked Carwin.. & Brock has more power & speed than Gonzaga so I'd expect if Carwin gets caught he'll be in trouble.. as will Lesnar.
Brock's chin seems to be steady enough hes took some decent shots from Couture & Mir, but he hasn't been hit as hard as Carwin could hit him. Carwin's cardio has yet to be tested as I suppose has his chin also, Brock will be hitting him far harder than anyone else hes faced.
Overall my feeling is Brock will beat Carwin, I'm thinking TKO but could well goto a decision if it turns into a wrestling match.