@Dolby I have done a ton of research regarding fiber (also spelled fibre but both spellings mean the same) systems since I got access to a high speed box in Europe, which I have since needed to give up due to financial reasons. I can't really tell you where I did my researching, due to a forum rule about leading people away from the site, but look up "Verizon FiOS" on Google and research a bit on "Fiber-optics" and their technologies on Wikipedia and you should find lots of information.
For your first question: I don't know which Lakeview is getting infiNET. Some people are already getting it in newer neighborhoods (i.e. Stonebridge) as that is where they are focusing most.
SaskTel will run the fiber to your house and install any needed equipment. The fiber will come into the house and go to the Optical Network Terminal, AKA ONT. The ONT converts the laser-based signal into electric signals, and back again when needed. The signals will got into a router and go from there
Onto the last question: Fiber and CAT 5E/6 are two completely different animals. "cat 5/6 fiber" as you put it, simply doesn't exist. But Ethernet signals can run over both.
The Internet and TV signals will run over CAT 5E or CAT 6 from the router, so run at least 4 runs of CAT 6 to each room from a central point. This is for future proofing, even you might never need that many runs, better overkill than not. Most people are going with CAT 6 "because it is better in some ways than CAT 5E", but to be simple CAT 6 can handle more, broader, signals over those hair-thin wires.
Fiber is best used for a backbone between buildings that have high bandwidth needs (such as those used on the U of S campus), using Fiber to send info back and forth between two computers at home is completely overkill.