Do You Think We'll Get A New Trial For The Next Gamepack And Expansion Before They Release?

I think it will be only for older packs, just like sales, to boost the interest.
They do not need to do that with new packs with the hype surrounding a new release, plus there are usually a fair amount of bugs at the start, better do that on older, more stable packs like city living so people have a better first impression and actually buy it at the end of the trial.