GG says there will be minor changes, but the new algo is mostly complete.
[Link to quote
flobaby, there will be minor changes, as we're always pulling in new data and Google's results change for some searches in the normal course of events. The main thing is that the improved rankings will be everywhere, but some of the underlying data will have changed too. It will mostly look the same.
BTW, sorry that I initially thought the switchover would be done over the weekend and it's taken a few days extra. The production folks get the final say about when a binary is switched, and I have near-infinite trust in the wisdom of our production folks. :)