Finally, the wasteland by my house will have activity!!!!
The widening you mentioned is on Main St., right? If so, that's not cause for too great of concern.... I hope. Right now, Main St. Jogs after the Queenston traffic circle. I suspect if they widen the road on the south side, it'll lessen the severity of the jog and allow for easier access.
Of course, it is also very important to mention that the Queenston traffic circle is due to be removed, being replaced by a T-junction with the LRT. We'll need further plans to determine just what they're up to.
It makes sense, though, if they end up building what looks to be a 12 storey building on that corner. If that part of Main ever wants to live up to its namesake, it'll need a greater right-of-way to accommodate street parking, but more importantly wider sidewalks (presently the bare minimum) and eventually bike lanes.