I'm surprised that Israel has waited this long. I really expected them to hit Iran before Bush left office. Simply because they knew Obama was a big pussy, and they would get zero support from him.
It appears that it has grown well out of Obama's hands now, and he doesn't have much choice in the matter, nor does Israel. I don't believe there will be much of a military response from any of these Muslim nations when it takes place, because they have always been big in the threat department, and offered up little in the way of action. Just the opposite of Israel.
There will be more gutless terrorism and a lot of tough talk, but little else. Radical Islam is famous for this. They talk about attacking nations, then wind up bombing a nightclub or a farmers market. Ahmadinejad is a gutless puppet. He can't even control his mouth, let alone Iran's military. The Mullahs there are pulling his strings, much like Putin is in Russia.