I've never heard of OptikTV 2.0 or 3.0. There is just Optik TV which is likely to be renamed TelusTV+ at some point soon. PikTV no longer exists so the Core plan under Optik is its replacement. Have you looked at Telus's website or the channel guide for the available channels?
AFAIK, Optik 4 is simply a date cutoff. Subscribers after a particular date receive the new TV box, while those of us with an earlier subscription date will receive it in the fullness of time. Using 3rd party equipment is the same no matter how you access Telus TV+.