If you remember, I’ve posted about this not so long time ago.
Seems that’s not true, I’ve transfered one site using 301
redirect about two months ago and Page Rank wasn’t
transfered yet.

Let’s see if my ”theory” will confirms that Page Rank
transfers after Page Rank update.

According to Adam from Google Groups it only takes a couple of weeks to do that.

301s pass PR and related signals appropriately. Usually takes a couple of weeks for things to smooth out, though.

I always thought that page rank from 301 to other site goes only after it’s updade, so I was wrong.