Although I support the already established interface (FireWire), I think USB 2.0 will become the standard.

If a Taiwanese motherboard manufacturer wants to make a board a cheap as possible, USB 2.0 is the way to go. Firewire requires extra hardware, requires the addition of more connectors, and usually a custom ATX I/O backplate for the case. On the other hand USB 2.0 is backward compatible with USB 1.1 devices, is faster than Firewire (probably slower in real life), uses the same connectors as USB 1.x, and will likely be integrated into the motherboard chipset.