The highly anticipated Galaxy SIII is looking to be absent from MWC 2012. Early rumors had it making its way to the conference but The Verge and German bloggers, Bestboyz, have reported that sources close to the project say it's a no go. The german site wrote "Today I learned that it is probably safe, Samsung will very likely not to introduce Galaxy SIII MWC. Currently there are two problems with the Galaxy SII successor. At a special event that will take place somewhat later, the phone will be presented"
Notice the comment "currently there are two problems with the GSIII." Thats quite a zinger there, and eventually the rumors will begin to fly as to what those problems are. There is, however, speculation that Samsung was uncomfortable with the delay between the global launch and US availability. The US is a key market for the South Korean company so this would make sense. What the other "problem" could be is anyone's guess.
Verizon passed on the GSII last year, lets hope they don't make that same mistake again with the Galaxy SIII.