...from a posting from Rogers Wireless Communications Service/Customer Care:

On Tuesday, January 9, 2007, Apple announced the unveiling of their new
iPhone, a combination mobile phone/digital music player/camera 

Availability
" The iPhone will first be introduced in North America (United States around June, 2007)
" Cingular is the only wireless carrier to launch the iPhone in the United States
" Rogers is actively working with Apple to launch the iPhone in Canada
as soon as possible and will be the exclusive provider of the iPhone in
Canada
" Apple is planning to introduce the iPhone in Europe (Q4 2007) and Asia
(2008)
" Please be advised that Rogers will be offering the iPhone exclusively
in Canada. Unfortunately, the launch date and pricing for Canada are not
yet available
" Other Canadian wireless carriers will not launch the iPhone, Rogers
will be the only Canadian wireless carrier to offer the iPhone


It's hard to say exactly how to interpret this but I get the feeling that Rogers is somehow going to be tied up with the release
of iPhone in Canada. ::-)

...and from another Canadian source: 
.... the iPhone will be available on a two or three year contract, and a data plan must also be purchased [from Rogers]

If you go by lag-times found in other "smart phone" releases (6-9 month delays), the iPhone might be arriving in Canada in late 2007 or early 2008.