Simmond Lens has announced the CineShade (buy here). It’s a cover that slips over the end of our lens, providing a mask that matches the field of view of your composition. Like lens hoods and matte boxes, its goal is to block stray light, which causes flare.
While it can’t hold filters, it’s a much smaller option than a matte box for blocking unwanted light while filming. If you don’t actually need any filters – or you’re using screw-on filters – this might be a practical option.