Unfortunately, CityTV (aka A-Channel) decided not to pick up Smallville this season. Instead they are airing Law & Order: SVU, so it wont be available to us on basic/standard channels.
MTS Subscribers can watch Smallville tonight on Channel 223, which is a premium channel that you have to purchase. Shaw Subscribers can watch it on channel 62.
The official CW trailer for Season 8 is below.
MINOR SPOILER WARNING!