You would have to be privy to all the PTTRX sells and buys of MBS's for 2012 until the ex div date to know that answer. But we have been given some answer a few days ago by Bill Gross who stated that those who bought MBS's prior to the Fed.'s announcement that it would be buying MBS's stand to make a lot of money. Believe that's all your going to get from PIMCO prior to any distribution this year.
It's an interesting question on what Bill will do. He got into the MBS's pretty early and is probably sitting on some higher yielding bonds than are presently available. Will he sell some, take the cash and distribute capital gains but continue the decline in the monthly yield or hold onto the winners let the NAV go up as yield stays low or even goes down (15 and 30 yrs mortgage rates hit another all time low again this week). The problem is there are few alternatives to the MBSs that aren't risky right now like Euro bonds. We'll know in December when we see the cap gain statement. Anyhow, I like our position right now.