Emily Farina's post indicates that the top speed was 152 km/h (95 mph), but Train 33 covers some 100 mph (160 km/h) territory. David Bellerive's post indicates that the train did reach 160 km/h.
I wonder which track speed category the train uses. CN lines often include many different speed limits for different types of passenger trains. The highest category is "LRC", which is currently only contains the P42 locomotives and Rennaissance coaches. Ironically the LRC coaches themselves are in a lower category since their tilting system was removed. I'm not sure why the Ren coaches have a higher speed rating, it's not like they tilt either. I hope the Siemens trains are categorized as 'LRC', which would permit about 5-10 mph more than the limits which currently apply to LRC coaches, and 10-15 mph faster than HEP coaches. VIA's comments about improved speeds suggest that this may indeed be the case.
I'm surprised they have open luggage racks. As I recall, the UP Express Nippon Sharyo DMUs needed to be modified from the American version to enclose luggage racks per Transport Canada requirements.
It also serves all 3 of Via's stations with high-level platforms, which is great for photo ops. And it serves 3 major cities in both provinces. Overall a really smart choice for a first run.