I'm having trouble understanding what the benefits are of going public for Dropbox. Increased financial reporting and the fiduciary duty to shareholders.

I suspect, as the article implies "there is increasing pressure to go pubic as investors look to cash out.

What features or new products could Dropbox develop with a few hundred million at they couldn't without?

I think the investors just want to cash out. If there was huge throw potential wouldn't they continue to raise VC money?