It's funny to see how divisive the NEX cameras are among enthusiasts. I'm definitely in the "why the hell would you put a huge expensive EF lens on that little body" camp, but I can definitely see the novelty in doing it if you've already got the lenses lying around for use on your SLR.
The key takeaway from this whole thread, along with pretty much all NEX-related discussion, is that there simply aren't any good native lenses available. There's an average quality kit zoom, an average quality superzoom, a pretty good 55-200, a junky pancake, and an OK macro. Then there are the two much-desired primes, one of which is a big disappointment (the 24/1.8) and the other being a Nifty Fifty that costs as much as the Canon 50/1.4 and is bizarrely long. Though the IS is pretty cool.
I read an interview with a Sony exec on one of the rumor sites in which he said something like "we're also going to be producing more lenses than we originally planned." I really think that Sony had very little intention of the NEX system being anything more than a P&S upgrader's tool, and were caught by surprise by the enthusiast reaction to it. If I remember correctly, the NEX-7 itself was designed as a reaction to customers' requests as opposed to a planned development. So far, those two aforementioned primes seem to be little more than SLR lenses with glorified built-in NEX adapters, and Sony's biggest concession to growing the lens lineup? A gigantic, expensive adapter that lets you use A-mount lenses. A very cool thing, but it's pretty sad that it's got to exist.
So basically Sony's created the king of mirrorless cameras (and it'll remain king indefinitely - I have no doubt I'll like the XP1 better but it's much more of a niche product), but his round table is pretty much the president's cabinet from "Idiocracy." Currently the only way to make the most of those wonderful 24MP and weak AA filter is to use either SLR glass or whatever rangefinder glass you can find with a retrofocal design. And there are plenty of doubts that there will ever be any truly good, compact native lenses, seeing as Sony shot themselves in the foot with their tiny flange distance (though Fuji seems to have solved that problem with the XP1).
Which is why Canon should be able to wipe the floor with Sony if they make a NEX-7 competitor instead of a Nikon V1 competitor. Slightly longer flange distance, a few pancakes, two customizable jogwheels, and a standard flash shoe, and they'll be off to the races.