You asked for it (probably), and Google delivered (definitely). Once you've enabled Docs offline within Google Drive -- you have, right? -- you'll be able to both create and edit Google documents and view Google spreadsheets sans a live internet connection. But now, Google's massaging the interface in order to automatically filter only offline docs while you're disconnected. Furthermore, those who'd like to preview which files are available offline while still online, you can tap More -> Offline Docs in the left navigation pane. Google's saying that it'll roll out to "all Drive users over the next few days," so hopefully your data plan will last you till then.