No effect... the new construction is supposed to protect the historic limestone elements and leave them in place, as-is. I don't think they will be restored - at least not right now.
The North Grant Park budget is being done with some really smart budgeting - they're salvaging pretty much everything, either by re-using it on-site or moving it to other CPD parks. They've even explored using tree trunks as site elements, either campground-style or with a colorful polyurethane coating. They're also incorporating some clever re-use on the Bloomingdale Trail, moving the Ashland bridge to Western to gain a clear span over there, repurposing sections of the retaining wall, etc. CPD's director of planning is really smart (met her on several occasions).
Sometimes the city surprises me with innovation and efficiency.
CDOT has done some re-use, too, but it seems like they're sitting on a lot of stuff that was placed in storage but never re-used (Ogden bridge panels).