Any soundcard that needs a diagram like this thing below to show how awesome it is is most definitely crappy or has its marketing team on IV shrooms.
Besides, it shows CD and MP3 audio - guess people don't play MIDIs anymore or equate their presence on a Geocities webpage with "crap" anyway, so they don't care for the sound .
But seriously - no, I don't see any SoundCanvas thingies getting built in there. No benefits for existing users and it adds to the price without having any advantages.
You're right in thinking that, but!
88-key controllers usually have piano-style keys - e.g solid ones, with weight, and sometimes something called "hammer action", and sometimes something called "graded hammer action".
The weight means you'll need more strength to put the key down to the bottom (this differs per model). The hammer action means that when you do this, it "feels" more like playing a real piano because the hammer on a grand or upright gives a slight kickback to the key - when it hits the string. "Graded" means that higher keys are lighter and lower keys are heavier. All depends on the budget you're willing to spend on a controller, and if you personally even like the action on a piano. Some are heavy, some are light-weight; all a matter of preference.
Velocity sensitivity is almost universal in keyboards, except maybe those with the mini-keys.
When you press down the key it sends a MIDI NoteOn signal. When you release the key it sends a MIDI NoteOff signal. The "bar" you see in the piano roll is the time between those two signals. That's also why you sometimes see a PANIC button; if the NoteOff is never sent the synth just keeps playing, and PANIC forces a NoteOff to everything.
Just make sure your first mix is not an mp3 of a recorded MIDI file with just a reverb effect thrown over it. Other than that, have a ball .
Eh, that's just advertising. Every company does stupid shit like that. Give an X-fi a try, though, and you'll see. I'm not tech savvy enough to throw numbers and specs at you, but it's one of the top choices of gaming nerds and audiophiles (think www.overclock.net and forums like those), so I don't think that many people could be wrong.
That product claims to do something which is, straight up, not possible. It fakes it with creative EQ and perhaps aural excitation, but the claims they are making about it are flat out not possible.
I think it's safe to say that it's crap.
Perhaps, from a listener/consumer standpoint, it's not all bad, but as a producer, it's completely useless, and introduces bias to how you monitor your mixes. You should never monitor your work on an "enhanced" system, you should monitor on as flat and transparent a system as possible.