Hmm, my Asus "Sabretooth" just showed up from Newegg today, and so did their Sandy Bridge email.
So, with Newegg's policy in their email, I can go ahead and install it, and when revised boards are available Newegg will do an exchange... am I reading that correct? If so, awesome, I'd rather go through them than through Asus customer service.
Yeah I expect that the only catch will be that since they are extending the warranty 'until replacements become available' that you will likely have a limited time for exchange (30 days??) from the time they mail you to notify you about replacements. So it will be pull the trigger then, or deal with ASUS (or MSI or whoever made your board) at a later time.