I found a post.
Android 3.0 Gingerbread getting revamped UI, Froyo living on for lower-end phones? -- Engadget
Important part :
"Like Windows Phone 7, Murtazin claims that Google will be laying down the law with some hardcore hardware specs to run 3.0, demanding a minimum of a 3.5-inch display, a 1GHz processor, and 512MB of RAM"
Google came out right after those articles were posted saying that they were just not true. Now, this is not to say that the original droid or low end phones will get gingerbread, but nowhere did google officially say that there was going to be a spec requirement.
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