It seems Google is continuing a negative channel.
Also several days Google announced it wants to become a wireless carrier. Read: people are shifting more and more towards mobile, away from desktop. Ads on mobile are not as profitable as on desktop, so they choose a different course with mobile. In other words expectations will probably be met, but forecast will be tougher.
Where do we go from here?
We will see 475 very soon - next week. Then slowly towards 450 closing the gap (early April ) .
And when 100 & 200 will be crossing the 500 keep in mind we could fall first to 420 before going up again.