My fingers are crossed for you that it arrives in time, whenever it arrives it'll be worth the wait though

There's not many people who buy one and then don't go and buy at least one more afterwards
The box sets will be pretty nice from what I hear. The image online at the moment isn't the box that will be used for the final ones, it's just to give you an idea. As you said, they're available for preorder at the moment so that everybody that wants one will have had a decent amount of time to get one. I can't see them shipping for a while though so you may still have chance to grab one further down the line.
The Isis is a pretty "puzzle", and if you're a collector with the cash then I certainly recommend one. In my opinion the solving of it pretty much all comes down to either a) a bit of luck, b) a lot of skill, or c) you finding the "11th clue". I recommend not searching for this clue if you want the fun of solving it! Also, be aware that to continue the adventure or to use their forum there is an additional membership fee.