According to the May edition of the City's Cyclometer newsletter, the G20 security zone will require that all post and rings will be removed 2 weeks before the event and installed afterwards.
The G20 Summit security requirements mean that all street furniture within the 'security zone' must be removed temporarily. This includes bike parking rings, of which about 1000 must be removed two weeks prior to the event. The area effected runs from Yonge Street west to Spadina Avenue and from Queen Street south to the lakefront.
Every effort will be made to replace the rings quickly once the summit has concluded by the final week of June. Posts will remain intact so re-installation will be simpler.
The security zone may still be a huge area, potentially going as far north as Queen St, as far east and west as Yonge and Spadina, and maybe as far south as the Gardiner. The actual size is all top secret.
I hope the feds and the G20 will reimburse the City for removing and re-installing all the street furniture; and while they're at it, reimburse all the cyclists for for having to walk blocks out of the way because there isn't any parking anywhere.