Is this going to be standard or can I upgrade to it?
I hope that it's an option but I have a feeling it will be reserved for S and X.
It depends on whether they want to intentionally limit certain premium features to the S and X. If they have a ludicrous mode 3 I would think they'd be willing to also have a bioweapons mode, but there also needs to be space for the filter as well, and there may not be enough.
Elon said at the unveil safest car ever. I'm assuming yes it will have bioweapon mode-it's just a filter function. Know that the rubber seals would have to hold.
Keeping the pressure in the car higher than outside prevents air coming into the vehicle.