Looks like the target date is on or before June 30th, and my guess is the deal will go through. They're just doing a little dancing for the FTC to make it look good. I certainly wouldn't short either of these 2 companies right now, with or without the deal they will both make a ton of money. Only see upside from here.
Companies involve say supposed to be first half of 2012. Currently MHS just bought out European partnership in last several days so appears business as usual. Currently arbitrage traders r in the mix with a large short position on ESRX. Pretty much the usual gaming in a stock/cash merger. Overall wil not be surprised if stock hits 30s as they attempt to scare stockholders away and get the stock on the cheap. Everybody knows how Paz is.