For anyone interested, the whole script for the Raw episode before this year's Rumble was recently leaked/released.
Biggest thing a few other places have noticed was that Heyman's and Rock's promos were all improvised and not on the script.
The abysmal promo Cena gave was because he tried to do the same although his original promo was on the script and was a lot different. Would also confirm the dirtsheets stories about backstage being pissed at Cena afterwards.
http://imgur.com/a/zPq5v