Google’s results have been scattered through their different data centers for quite a few weeks now. Some showing certain results and links and another showing completely different results and backlinks.
IMO they are tweaking things in anticipation for another PageRank / Backlink update (it’s close to three months), and in order to increase the quality of search results.
BigDaddy is NOT an actual data update or algorithm update, it is a new infrastructure for Google that they have not used before. Now most data centers are switching over to BigDaddy results and should all be in sync before long. Once that happens I bet Google updates PR and BL again.
My guess – V-day (Feb. 14th)