From TechNet Online Concierge Chat...
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{Corey Kracht} Hello and welcome to the TechNet Online Concierge, how may I assist you today?
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{Chris Shilt} Will Microsoft change the behaviour of Automatic Updates? Will AU install XP SP2 on computers with AU turned on?
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{Corey Kracht} Yes XP SP 2 will be deployed on computers with AU enabled.
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{Corey Kracht} When it is released of course.
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{Chris Shilt} Grr. Why the change?
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{Corey Kracht} That I do not know
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{Corey Kracht} You could call into technical support, they may be able to find an answer for you.
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{Chris Shilt} This may make a lot of corporate customers unhappy, but thanks for the information.
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{Corey Kracht} Understood. No problem Chris, Is there anything else I can assist you with today ?
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{Chris Shilt} No, thanks. That is all I needed.
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{Corey Kracht} Ok Chris, Thank you for contacting Microsoft! Have a great day.