Highway 7 - Kitchener to Guelph

[Markster]

Construction Phases:
... Work underway - connection of Wellington to Bingemans Centre Drive - when to be opened?

The Wellington/Shirley straightening is underway, and will be complete within 2017.

... Extension of Bruce through to the rebuilt interchange at Wellington - is there a published timeline for completion?

The extension of Bruce will be some time, as they have to tunnel under the tracks.  I suspect the earliest would be 2018.  They've already begun clearing the approaches.  I suppose it's possible it may complete in 2017 too.  

... Is the closing and rebuild of Victoria Street bridge over #85 going to happen and if so when?

The rebuild of Victoria St bridge will happen, but there's no timetable.  We have our fingers crossed that it's after the Bruce St extension is complete.  This article (from 2015) claims 2017.

... What is the contract situation and is there a published timeline for the new 18 km roadway and interchanges between #85 & Wellington in the west to the north end of the Hanlon in Guelph?

The contract is tendered and underway.  I can't seem to find anything that actually points to when the road will open though.  This article says it will take "5 construction seasons" to finish.  That would give an estimate of 2019/2020.
The interchange with 85 is going to be the critical path. They've already begun earthworks. There are a lot of bridges and flyovers to build. Don't expect to see any of the road opening in stages.

General:
... Is access to the new highway to be 100% interchange controlled or will there be lights / stops?

100% Interchanges

... If 100% interchange controlled, are the interchanges proposed in the image at the top of the thread accurate and approved?

The image is final.

... What will the speed limit be?

I don't think there's been any statement, but I would imagine 100km/h.  The MTO doesn't build freeways with anything less than a 130km/h design speed these days.