^Yes this may happen. Once the 4 car platforms are finished late this year, there may be (very) limited 4 car service as they may be able to draw a little from the current fleet to provide it.
Once enough new LRVs arrive from the order of 60 that just went through, more 4 car service will be added. That will happen throughout 2015.
The 4 car service will geared so as to be maximized during rush hours and events (hockey, football games, concerts, etc.)
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