I wouldn't jump the gun yet and change it. It depends on what the purposes of the links between the sites are.

Here my best "interpretation" based on everything I have read and seen:
1. Excessive crosslinking bewteen sites on the same class IP address probably will get penalized.
2. Non-excessive crosslinking between sites on the same class IP address probably will not get penalized.
3. We do not know where "the line in the sand" is between excessive and not-excessive is
4. I do think that links between sites on the same class IP address will pass on PR and not penalized as far as PR goes.
5. If the Hilltop algo (or a version of it, eg maybe LocalRank or TopicSensitive PR), then links between sites on the same IP address are not penalized, but are just ignored in that part of the ranking formula.

Read the whole Hilltop analysis in that link above and see if it does fit your sites/problems - it may not be an issue.

CBP