They contracted the final design in October. Bit of a rush because they are approaching the 10-year lifespan of the temporary bridge. Construction to begin in 2024. It's for both the bridge over the GO tracks and the bridge over the Gardiner. Looks like it includes grading both sides, and TTC tracks (or at least an allowance for them) over the bridges.
Looks like it's been a litany of Metrolinx-caused delays. After the installation of the temporary bridge over the tracks in 2014 (the original bridge was over 100 years by then, and in very poor shape), it took Metrolinx until 2019 to conclude that the existing elevation was okay for their electrification plans. In the interim they both promised, and then reneged, to include those bridges (plus 2 more further west) as part of their Lakeshore West works.
Here's the link to the City Council contract award, which links to the supporting documents:
http://app.toronto.ca/tmmis/viewAgendaItemHistory.do?item=2021.IE24.5