Good news for anybody with an Creative Cloud subscription. Adobe has just added Lightroom 4 to the Creative Cloud so it is now available for you to download and use. If you are an active subscriber you should have already recieved an email notification.
I'll be most curious to see how well the Creative Cloud service sells for Adobe. How many will adopt the rental modal over the ownership model. From the math I have done, it looks like a good value if you normally upgrade every year. But if you upgrade every other year or in a longer span, it makes more economic sense to buy than to rent.
Are you using Adobe's Creative Cloud service? I'd love to hear what your impressions are so far.