Ok, so I just want to talk about these two shots here. First up we have Metatron during his opening monologue about what is important in a story - the monologue in which he places a bit of emphasis on subtext. On the shelf in the background we see a number of things; among those things are three items that are of particular interest - an arrow, a cannon and a cup/trophy. We’ve seen Cas associated with arrows many times during the last two seasons. Trophies are symbolic of prizes, winning. And the cannon, which may be representative of Dean, or it may be representative of story telling - in other words, a cannon representing canon. This is also a shot in which we see the Supernatural books strewn about.
In the next image, we have something that the wonderful and amazing Desticus has noticed: Cas tied up next to a side table, and on that side table? A deer-like animal. More specifically, an Impala-like animal. We can’t be 100% sure, but it sure looks like an impala, as shown in the final image. So in one room, we have:
1. An arrow, representative of both Cas and love;
2. A cannon, representative of both Dean and truth;
3. A cup/trophy, representative of winning/endgames; and
4. An Impala, which speaks for itself, really.
I’m not saying canon Destiel, BUT IT’S LOOKING PRETTY GOOD.