Philipp Lenssen of Google Blogoscoped managed to get a copy of a leaked internal Gdrive client (currently codenamed as Playtpus). It is currently being used only by the Googlers (Google employees) to store and share files, and there is currently no information whether the product will be made public.
Its help say,
We encourage you to keep all of your files with us, including your Office documents, photos, and personal notes, except for sensitive data (including electronic protected health information) and other files inconsistent with the internal user agreement.
Via Google Blogoscoped.