I have read this article when it first appeared on Hacker News: http://news.ycombinator.com/item?id=542531 and I was in doubt whether to believe it or write it all off as April's Fool joke. The design looks interesting and reasonable, but... who releases serious information on April,1 really?! If they were actually serious, I was sure they would release this a day later or earlier.

Now, quite some time later, I read this again and I am not convinced by the article. The comments also do not offer evidence that this is not a joke. Nor the video that you posted, until the second part. In the first part all it shows are some containers and industrial machinery; nothing indicates that there are really servers in those containers or all of this stuff is actually Google's. Now after the second part I believe that it all was for real, after all.

I wonder if Google is playing with us on purpose, releasing the information on April,1. Or Maybe they just don't care a single bit about such things?

Well, gmail was announced on April, 1, with an unheard of 1 Gig of storage, so I think Google likes to do this sort of thing on purpose.