new codes?

Does old code need to be replaced

[rbacal]

Trying to cover the bases. Anyone know whether these changes mean we have to update the adsense code on our pages?

I though someone alluded to that.

[QuoVadis]

No , you dont have to replace them again. the old ones are working fine too.

[401khelp]

Anyone know whether these changes mean we have to update the adsense code on our pages?

You only need to update your code if you want to use one of the new formats or make some other change. If you have no desire to make any changes, then you existing code will work just fine.