yeah, in principle, the two sides should be able to come to an agreement on a price, even BEFORE the release of GTA4, like i said in the previous thread.
i haven't found out why ERTS decided to go public with this. sometimes, apparently, in these kind of negotiations, higher-ups are advised to go public when they have a fear that the news could be leaked, and so in order to prevent those illegal trades from happening you just go ahead and release the news.
more likely it's just to gauge the market's response--are the shareholders willing to sell out at a 62% premium? in the MSFT-YHOO case, apparently it is the case. ERTS probably wants some input from the market.
my guess is that market won't be happy with a 62% premium. i won't be surprised if it goes to 100% if ERTS want to close the deal before GTA4 is released.
EDIT: in the MSFT-YHOO, it was unsolicited by it's a little different. but anyway, the response from the market is the relevent part here.