We've made significant progress in this area in the last couple of months. While we don't have
core support available for uploading direct to S3, we do have an ultra-cool JS library and API that can be integrated into a FarCry project for both single and multi-file uploads that create FarCry content items bound to the media asset.
The uploader is tested for files as large as 5GB and as many as 50 files simultaneously. The solution works natively in any modern browser, shows progression and can even auto resume on connection loss.
We're hoping to make it more readily available, but at the moment we don't have the resources to port the solution into core. If anyone wants to help fund the port to the
core code base for their project please give me a shout.