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It won't come with it but you will be able to download it for free once it is released.
 
It won't come with it but you will be able to download it for free once it is released.

I see it's advertised at £20 or so on the apps store. Do you mean that if you bought an apple within a certain amount of time they're giving the upgrade free?
 
Apple press release (for those who prefer straight from the horse's mouth)

"The Mac OS X Lion Up-To-Date upgrade is available at no additional charge via the Mac App Store to all customers who purchased a qualifying new Mac system from Apple or an Apple Authorized Reseller on or after June 6, 2011. Users must request their Up-To-Date upgrade within 30 days of purchase of their Mac computer. Customers who purchase a qualifying Mac between June 6, 2011 and the date when Lion is available in the Mac App Store will have 30 days from Lion’s official release date to make a request."
 
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