As far as I know, it will be available "next summer". And only the marketing department of Apple knows (IF they know it already) when it will be a free upgrade to buyers of an Mac and what the upgrade costs will be.
Better ask in one of our Mac forums: http://forums.cnet.com/mac-forums/
That's where the Apple experts are. Not here in Deals and Bargains. Apple fanboys aren't interested in deals and bargains. They want the best, whatever the price.
I am planning to buy a new MBP. But after the announcement new OS, I have hold myself till the new OS is launched.
I will be really thankful if anybody can give me following information
From when onwards, the new bought MBP will be entitled for a free upgrade.
What will be cost of upgrade for Leopards users
When will be the official launch