Any Annually Schedule for PR?

Any Annually Schedule for PR Update from Google Adsense?
if there is any then kindly let us know.

Thanks in advance..
bye bye

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Pr updates are usually done every quarter. I think the next nearest schedule for an update would be June, but the big G has been known to be unpredictable.

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So google is updating every quarter which means they are going to update March and June would be the next PR update?. Or I am wrong?

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Actually there are PR updates every 4-5 month .
But there isn't any specific official saying by google about that.
I just think they should provide these type of information through any of their sites

They seem to happen quarterly and my sites changed just yesterday. Is anyone else seeing a change?
Best

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PR updated already couple of days back.

i got few in PR2 Now

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Where does AdSense come into the equation? It doesn't feature at all.
I don't think they do have a prearranged schedule because I remember Matt Cutts posting on his blog once that it had happened and he didn't know anything about it until afterwards.