Something I've thought:
The XServe was never a consumer product, like I mean, the base, general consumer... Consumers use desktops, laptops, iPods, iPhones, iPads, and routers. The only thing that Apple makes that's not in that category (besides software and peripherals) is the Xserve.
I always thought it was weird that Apple sold a server product. It just doesn't fit in with everything else they made. I think that it makes perfect sense that Active Storage, a company founded by past Apple employees, will be a subsidiary, if you will.
The way that Scion is a division of Toyota. Toyota makes cars, Toyota was always their own thing. Now, under Scion, they can make an entire different line of cars, which don't necessarily get associated with Toyota. The way GM's Pontiac brand almost always took cars and rebranded them from other divisions. Pontiac is its own thing, and does its own thing, yet GM oversees it.
I think this makes perfect sense for Apple - should this be the actual case. Apple can continue making the Xserve, or at least oversee its production. Apple can control it, and Active Storage can sell it - Apple still essentially makes the Xserve, but is no longer associated with it.
* Plus, for all those non-tech-savvy people that don't read MacRumors, they don't think twice. Apple made the Xserve, discontinued it, and now a totally separate company is picking up with a "new" product.
* * Even more, if Active Storage focuses primarily on the Xserve, this one product will get a lot more attention as the head of their lineup, as opposed to the end of the lineup that it was at Apple.