Along with the manual, there's a kix2001.txt file that explains the evolution of the product. You may also want to look through the Beta forum as the changes do get discussed there.
Some of the changes that have bitten me are InGroup() and ReadProfileString().
At the end of the day however, the proof of the pudding is in the eating. Uninstall the old RPC service and install the new one and then test the script with a small control group.
Post back your findings.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.
