The tech blogs are testing GDrive right now!
Not only does it make sense, but I have proof.
Yesterday I tipped a lot of tech blogs (including The Verge) that GDrive screenshots have been leaked: http://www.talkandroid.com/102428-leak-google-drive-screenshot-shows-2gb-of-storage-on-tap-for-mid-april/
Obviously leaked screenshots are huge, considering the mythical proportions GDrive rumors have reached.
Yet not a single one posted that story. Why? It's obvious. They have gotten early access and they can't break the embargo, even if the leak itself wasn't from them.
Further confirmation is that talkandroid.com isn't a very big site, so it obviously didn't get early access. Which explains why they posted the leaked screenshots.
Can't wait for GDrive! But 2GB? That's disappointing. Considering that Google Music offers 50GB, I think that Google should surprise us all with 100GB! (Seriously, that would be awesome.)