Its been reported like crazy everywhere else... (178,000 times in last 24 hrs) but what is it? Basically they made their index completely fluid where they can scale and insert at any time to their hearts content... you should read the official post on some of their little factoids... like  

In fact, every second Caffeine processes hundreds of thousands of pages in parallel. If this were a pile of paper it would grow three miles taller every second. 

crazy stuff... and this is the prediction i made... that new layout would drop abound time of caffeine. i think i was close i think its something like 2 months and unless im told otherwise its been my understanding its been being tested and rolled out more and more this whole time (matt cutts said it didnt have anything to do with "may day" update )

so if you have any questions or anything to add please bother me below...