Perhaps the new architecture means that more pages are indexed more frequently. Could it be an architecture that supports more "realtime search" (after twitter search). I notice the news is pretty up to date.
yah most notably the amount of results is larger but also the actual results are different with every query I have tried. At least half of the first page is always different.
Regular version: Results 1 - 10 of about 104,000,000 for sex [definition]. (0.13 seconds)
7 times as many results for the same exact query
edit: speed wasn't an improvement, but definitely the number of results are.