Not going to happen. The RC keys are free and can be activated on any number of machines. The retail however will only come with one key, that can only be activated on one machine at a time. If you want to activate 7 on two machines, you will need to buy two copies.
I'm glad that both versions will be supplied but clearly you are meant to only use one of those and presumably only the last one activated will work without a genuine advantage type warning showing up.
You are correct. For anyone who plans to purchase Windows 7 when it is released October 22nd, you might like to know that you can now pre-order your copy of Windows 7 for a discounted price! For more information, see the Windows 7 Pre-Order offer page here: Windows: Windows 7 Pre-Order Offer
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Microsoft Windows Client Team
Thanks loathe and Jessica for clearing that up - one guy on another forum had been saying that you could install the full version on two computers, which I was reluctant to believe as I had come across this in the past when I bought a laptop from Dell and I bought the full version of XP Pro at the the time as the salesman had insisted that I could install it on two computers - only to find out later that I couldn't activate it on the 2nd computer I installed it on. I spoke to MS support about this and they confirmed it could only be installed on one computer. I was livid with Dell, but they refused to do anything about it.
I have now posted these comments on the other forum pointing out the error in the original post.