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Also - if the only change is the domain name, (URLs are otherwise identical, content is otherwise identical), then you may see more of a hit at Bing than Google simply because Bing emphasizes age of content a bit more. Also I'd highly suggest a comprehensive link building initiative as the new domain goes live so while you're working to get as many existing links pointing directly (to bypass 301s on those 3rd party authority signals), you'll also want to have a variety of new quality links to show that "this new domain really is still authoritative and trustworthy".  That should help ensure any hit you take is not as long as it would otherwise be. I'd also encourage a press release sent out through PRWeb.com or PRNewswire.com, and social push announcing the change.  All these are as much for signals confirming it's a legit transfer as they are for other SEO reasons.