Dave Meltzer noted on Wrestling Observer Radio that CM Punk told WWE that he was going home right before RAW started this past Monday night, which was why the show had to be re-written at the last minute.
WWE apparently did not see it coming, although they expected him to leave in July when his contract expired. Punk admitted in an interview last week that "everything is up in the air" in regards to his future with the company after his contract expires.
We noted last night that Punk was still appearing on the event page for Elimination Chamber, despite being removed from all other upcoming events. He was removed from the Elimination Chamber event page early this morning.
While Meltzer said that he wasn't sure exactly what incident led to him finally leaving, he said that Punk had seemed generally frustrated over the past year. It was noted that he wanted to be the top guy in the company, and knew that it wouldn't happen with John Cena on top. Punk has been saving his money and has made a lot over the years, and felt like he didn't need to stay with the company if he didn't want to.
PWInsider added that there was talk that Punk was either supposed to lose to Antonio Cesaro on RAW after Kane interfered, or do a promo about Kane eliminating him at The Royal Rumble. Either way, he was scheduled to be on the show.
The last message that Punk posted on his Twitter was on Monday night, which could be taken as a farewell. He wrote: "Thanks for all the support. Keep being you guys, it's pretty cool."