From Dataviz's Facebook & Twitter: "Documents To Go has been submitted to the App Store! Thanks to everyone for your patience, we know you've all be waiting for a while. Should be live in a few days!" http://www.facebook.com/pages/DataViz-Inc/59056732244?ref=s http://twitter.com/DataVizInc/status/1849895022 Hopefully it'll be worth the wait...
Looks like it still hasn't been approved by Apple yet-according to DataViz's Facebook it's taking a bit more time for approval.
In the meantime Quickoffice delivered an update with enabling text correction, copy&paste in spreadsheets and other stuff users demanded. It will get harder and harder for DocumentsToGo. Maybe they did find an (illegal) way to access the mail attachments and that's why it was rejected.
There is no announcement so far. But the versions for other platforms are $30, so it's very unlikely that it will be less than $20 for the iPhone version. For Android the limited-time introductory price is $19.99. Maybe it will be similar for the iPhone.
Appears to be out now, priced $9.99/£5.99 http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=317107309&mt=8