Again pure speculation, but based on a decent understanding of how businesses have to operate, especially in todays awful economy where the majority of disposable income has been disposed. As well as a lot of knowledge regarding PR and messaging, I believe the additional press releases were further evidence of this being a lot more about dollars, cents and sense.
Just like this thread, I would imagine word got back that plenty of investment institutions were also stuck speculating. The last thing desired is to leave an open end for the talking heads on all the business and technology networks to speculate on the sexier negative side.
Thus creating a vacuum which usually doesn't get filled with positive speculation and benefits of doubt. A big question mark oft results in feelings of fear in the market which leads to panic sell-offs.
If too much momentum began to build, after hours trading could become a nightmare. Since it's Friday, it would be difficult to get the message out during the weekend. This could have then resulted in major movement in the Asian markets Monday morning over there.
One should never underestimate the irrational behavior caused by the immense power fear can have as it hits people at a much deeper animalistic level, which causes all to ignore higher senses like reason and logic.
This way they have insured that the message they want sent is the message received. Now they look like solid decent guys who have big hearts.
I don't want to be cynical, but this was calculated. What I find rather surprising is that it wasn't part of the initial release, so all were left dangling.
On a personal level I am sure many involved are truly saddened by Jobs' unfortunate passing. But you don't get to the top of companies by allowing emotions to dictate actions. It is irresponsible and the people at the top are keenly aware of this truth.
walkin the walk while tappin the talk