The Search and Submission Details interfaces now return the pagecount per submission. This means you can quickly find out the number of pages attached to a submission without having to look at its files array. This new field is particularly useful on the Search interface as there was previously no way to tell how many files were attached to a submission just by its search result entry.
With the new pagecount field being returned by the Search interface, you can now emulate the Inkbunny functionality where we show users that there are multiple pages on a submission before they view it. We do this with a little pagecurl overlay icon and the page count on top of that, which gets stuck over the top of the submission thumbnail wherever it appears in a gallery view. But there could be many other neat ways to show that a submission has multiple pages before anyone clicks on the thumbnail.
For further information check out the new "pagecount" properties in the API documentation (there's two places where that field now appears): http://wiki.inkbunny.net/wiki/API
If anyone notices missing fields or other functionality they want in the API then please let us know via a Support Ticket (it's easier for us to track feature requests via tickets!).
For now only the essential submission details, search and upload/download capabilities are supported by the API.