With respect to UPX, I suspect that once some sort of RER service on the Kitchener Line gets implemented, we will see UPX stopping at Union, Bloor, Eglinton, Woodbine, and then Pearson. Weston will likely get dropped, as it doesn't have any type of connection to an RT line, whereas the other stations all do (or will). Any future Kitchener RER stations (King/Liberty, St. Clair/Weston) will be skipped as well.
With respect to extending the FWLRT, I strongly suspect we'll see an announcement about extending to Woodbine GO before the current FWLRT opens. It's such a small extension that it wouldn't be a huge budget hit and would have enormous connectivity benefits. Its opening will probably be tied into the opening of the Woodbine GO Station. The FWLRT will then likely be extended further down Highway 27 to Dixon Rd, then along Dixon into the future Pearson Hub (whenever that comes to fruition).
With respect to extending the FWLRT, I strongly suspect we'll see an announcement about extending to Woodbine GO before the current FWLRT opens. It's such a small extension that it wouldn't be a huge budget hit and would have enormous connectivity benefits. Its opening will probably be tied into the opening of the Woodbine GO Station. The FWLRT will then likely be extended further down Highway 27 to Dixon Rd, then along Dixon into the future Pearson Hub (whenever that comes to fruition).