SPOILER WARNING.
IF YOU HAVE NOT COMPLETED THE MAIN STORYLINE UP UNTIL THE END CREDITS,
PLEASE LEAVE THIS THREAD IMMEDIATELY.
Hey, folks! Burning Passion here! I figured I'd take some time to analyze something I spotted recently. As part of Yoshi-P's "Happy New Year" post, he also included a very interesting graphic.

For those who can't see the image above, it reads:
Lances of light herald the dawn,
Beckoning shadows deeper still.
Splendor dances with shades
Unsheathed, a rime kissed blade
Spills crimson o'er fields of white.
-From the journal of Louisoix Leveilleur
Now, I am fascinated with this sort of thing and I figured I'd attempt to decipher this poem verse and reveal its secrets!
Lances of light herald the dawn. - This tells of the Warriors of Light heralding the dawn of a new era, which is essentially what happened at the end of the 2.0 storyline (once you finally, truly take down Gaius van Baelsar and destroy Castrum Meridium).
Beckoning shadows deeper still. - This is a clear reference to the Ascians and their ultimate goal to summon Zodiark as well as many other powerful foes who await in the future that threaten Hydaelyn.
Splendor dances with shades - Light and darkness will clash with each other... or join forces. That part isn't quite clear on which.
Unsheathed, a rime kissed blade - Something about a frozen blade or sword, or perhaps a being of ice and snow being used as the weapon of someone else, perhaps as a puppet?
Spills crimson o'er fields of white. - Obviously, this one implies that blood will be spilled on a field of white. "Field of white" could be two things. The obvious answer would be Coerthas. The less obvious answer would be if a certain battlefield were to be coated in ice and snow by the possible figure in the previous verse.
So just to recap, here's my VERY rough translation of what I think it to mean:
In the dawn of the Seventh Astral Era,
There are more powerful foes hiding within the shadows preparing to strike.
Light will combat/ally with darkness.
A being/object of ice and snow
Shall spill blood in a frozen tundra.
Feel free to reply, remarking on what this could mean, or to tell me that I am completely wrong. But you're not allowed to tell me I'm wrong without giving your own theory!
As for my theories on what this means... the Ascians have conquered and harnessed the power of an Ice Primal. This could mean Shiva or, if the Ascians are purely interested in Ivalician lore due to their worship of Zodiark, they could summon Mateus instead. And when they summon this new primal, they will unleash its power unto Coerthas or they will find a new battlefield for which to test the Warriors of Light.
Of course, the part about "Splendor dances with shades" could mean that you may find yourself in a temporary alliance with Garlemald, though I'm still not entirely sure.