There's a lot to like in the upcoming release of 2011-12 Limited Hockey. But one insert in particular -- the dual-signed Back to the Future Autographs -- is sure to be among the product's most coveted inclusions. Every card in the compelling insert unites one current superstar with one all-time great (along with their respective autographs), and the many generation-spanning, franchise-focused pairings will most certainly provide wantlist…