I'd expect the compute flavour to expose the PCIe bus, so SATA or NVMe would be easily added as no USB3 chip hogging it. Indeed I'd say that is not only a given avenue, but the angle Mr Upton was hinting towards given the I/O side of things currently from the SOC.
Like many - pre Pi4, was wishing for a SATA port, but overall, if they did do some upgrade to the Pi4 in another B+ or 5 flavour - then I'd be more interested in a faster USB flavour, like 3.2 or USB-C. Reason being is that it would be more flexible and those who want SATA or NVMe would be able to tap into that. Certainly more flexible in usage and that does seem to be key.
Like many - pre Pi4, was wishing for a SATA port, but overall, if they did do some upgrade to the Pi4 in another B+ or 5 flavour - then I'd be more interested in a faster USB flavour, like 3.2 or USB-C. Reason being is that it would be more flexible and those who want SATA or NVMe would be able to tap into that. Certainly more flexible in usage and that does seem to be key.