Lately the publically available PR and backlinks is updated about monthly. It happens internally at Google more often or on a different schedule (ie search results have not been changing when publically available PR and backlinks change).

The Flordia and Austin "updates" were not PR and backlink updates, they were a change in the ranking algorithm.

BTW, as Google only show a sample of backlinks (and never then all) and PR is a smaller part of the ranking formula, these updates are bit of an anticlimax compared to the past - they are not worth "sweating" over.

CBP