I heard it mentioned first in this Toronto Star article. It's apparently a poll done by a firm called Robbins SCE back in December. I remember Robbins doing a series of BC polls late last year (which were removed from Wikipedia due to not being considered a major pollster), but never heard of them outside of that province.
This poll assumed two things: that Papineau MP Justin Trudeau was the Liberal Leader, and Brian Topp was the NDP leader. And here's the results that followed:
Well that's.... not really much better than where we're currently at.
The biggest warning sign that this scenario might not be all it's cracked up to be is the result in Ontario and Quebec; while they're better than where we stand right now in general polling, it doesn't really seem like enough does it? The NDP and the Conservatives still hold wide leads in all but Atlantic Canada.
It's a bit disappointing that Trudeau gets low results in Quebec too (historically speaking). However, at least this proves that simply getting a big-ticket name to run as Liberal Leader won't do the trick either.