Mac OS X Lion: Best Mac OS Yet?

"We're taking our best thinking from iPad and bringing it all to the Mac with Mac OS X Lion, available in summer 2011. Here's a preview of some of the top features."

Much of the visible sizzle in Lion is, as Apple says, "The power of Mac OS X. The magic of iPad." This pretty much sums-up the upcoming features of Lion: making the OS X desktop look and behave more like an iPad, while adding or updating some powerful OS features behind the scenes, like AutoSave, Versions, Resume, AirDrop, and FileVault. And the new mail client (Mail 5) will be appreciated, with its new UI. I'll be eager to test this on my MacBook Air, and I do hope that Apple is reasonable with upgrade costs, but, I wonder how all this sizzle (gestures and animations) will play on my older desktop iMac with only a simple keyboard and mouse.