@JenCluse:
I think you're talking about ISIS (shown here)
http://www.samtel-hal.com/cache/isis.pdf
It's a digital display, and yes air data will still come from the pitot tubes and static vents (as would be the case with "steam gauge" hardware too), but the data is taken from standby units as I understand it - it is intended to be independent of the main systems. At present there's no evidence that any data on either the main PFDs or the ISIS display was incorrect - other than airspeed data, which was anomalous for a duration of approximately 45 seconds.