The city puts every report they issue online for public consumption. It's not hard to find an answer to your question (yes, there will be a retail unit).
According to the table in that document, there will be 400 m² of nonresidential use in this property. That's approximately 4300 ft.² or one convenient store and a drycleaner. Not very exciting stuff.
The ground level / project footprint is very tiny. Factor in the vehicular garage entry ramp and it's no wonder why the retail area has to be so limited in size.
Based on construction photos I've seen for most highrise foundations in Toronto the most favoured foundation type is reinforced concrete footings. Looking at the digs you see a lot of shale which to my understanding is strong enough to not need piles.
Very few tall buildings in this city are sitting on piles. As Mo-tage notes in the post above, our underpinning 'Dundas' shale is strong enough to take the weight without them. Typically the shale is close enough to the surface that most foundations go right into it.
With shoring now complete and excavation 99% complete, our construction teams have started the installation of footings at our Ten York community. Typically made of concrete and rebar, the purpose of footings is to support the foundation and prevent settling.
The first construction crane has also been erected on-site.