Yeah, I got the developer key and downloaded it this morning. There is a notifications bar that swipes out now from the right side of the gui. They have beefed up wifi encryption for the os and booting from a 64 bit kernel with a hyper thread node for the intel "i series" processors is pretty snazzy. It also looks like they are getting ready for the retina display technology perhaps in the next series of macs.
One amazing thing is that is also seems optimized for solid state booting in terminal. Boot time from pushing the "on" button to login is 4.6 seconds, which is fucking ridiculous.
But in short, my imac looks more like a glorified ipad, so I still have most of my authoring apps on snow leopard.
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