Gamespot as a DR review out for the HK edition.
Obviously they give a very basic review, almost as much time devoted to costumes, bowling mode omissions, and so on. But they did mention that the graphics are the same as the arcades, just in 1080p, if you have that.
They also mentioned occasional if rare slowdown.
From what I hear, this is an occasional problem on the PS3, which is has the same RAM as the Xbox360, but a much much more ponderous/resource heavy OS.
Honestly, I fear that if gamespot noticed slowdown enough for them to mention it, anyone who actually cares about timing would be totally frustrated by this.
*cough*