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CoreAudio is the native audio API on OS X, not ASIO. Any class-compliant USB device should work to the fullest potential of the hardware, in which I mean buffer sizes (latency) and sample rates, out of the box essentially. Extra features such as system wide volume control may require vender supplied drivers.
I'm not as familiar with Firewire as far as drivers go. The USB board has a standard for Audio devices, among many other devices types, I'm not sure about Firewire. That being said, Firewire will most likely give you the least amount of latency simply due to how the protocols work. USB has an "at best" latency of 10ms each way just to transfer data from the USB port to the device. Plus being CPU bound and a shared channel means high CPU usage or a saturated USB hub can cause additional delay or drop outs.
Finally, yes, the Blackjack should show up as a regular CoreAudio device that you can pick ins and outs for in any DAW. You could just plug it in and see that for yourself. I'm not sure that would make a difference with latency or quality over the internal sound card of the MBP though. I think mine supports 24bit/96khz natively and is connected through either the PCIe bus, thus in theory giving it less bus related delay. The port is noisy and unbalanced though if that's a concern.
If you're not familiar with OS X and audio devices, you can plug in the Blackjack and go to System Preferences -> Sound -> [Output] and see the device listed. You can also go to /Applications/Utilities/Audio MIDI Setup and from the Audio Devices panel (under the window Menu) can select the default output in input channels, bitrate, samplerate and finally channel gains if supported.
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