I wouldn't be surprised if Google did finally release the GDrive. This would follow the company's current trend of cloning successful businesses far after a competitor has established market dominance. Google+ is actually rather well built, but nobody is going to flock to it when there are numerous other social networks that have the same (or more) features. Dropbox already solves the problem that GDrive would tackle. Is GDrive going to have some killer feature that will entice people to make the switch? Probably not. Also, I'll bet GDrive won't have the platform coverage that Dropbox does, at least initially.