With the new release Passport has obtained the option to be fully stateless device.
Actually, the newest update introduced two new formats. One is the standard stateless signer, where the device wipes the seed from its memory when you shut it off. The other is a type of hybrid state, where the Passport can keep one seed in its memory even after you turn off the device like any other hardware wallet. However, a second seed can be imported. That one will have the device function in stateless form. When you turn off your device, only the temporary seed gets deleted, the main one remains. According to their blog, this feature is available through the Key Manager. Yeah,they did this, Personally for me the hybrid format is not of profound interest (nevertheless, I may assume that some users will find it useful). At the same time its stateless mask turns this device into virtually impenetrable enclosure for BTC. I'm fully aware that at such stateless mode there is the increasing concern about the safety of the relevant SEED/SeedQR but I'm dead sure that the sophisticated scheme I use doesn't let me down.
Unfortunately they don't allow US users, which is by far the largest customer segment for us. Would certainly be interesting to explore some sort of integration in the future, however. 