Its coming and will get here eventually....
Personally PR does not really interest me, its relevence to SERP's has declined to the point thats its almost useless. Its more an ego thing I find, wanting to have a green bar that is bigger than someone elses

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PR is so easily manipulated that it is very easy (with the right legitimate techniques) to get a high PR ranking site almost as soon as the first update. Let alone using the underhand techniques!!
As for the PR predictors, don't bother tbh they are usually based on outdated algorithms because Google uses a base formula and then adds various 'factors' to it. Just take a read of matt cutts blog and do some in depth reading into the 'bigdaddy' infrastructure updates to three of the datacenters..some interesting developments there.