User blog comment:Zathronas/Analysis by an author: Trailer "RED"/@comment-3577170-20131220210037

So i believe that the Red Trailer is in the future and Sumer Rose is Yangs real name and she some how dies. Now reading the poem i got this out of it,

’TIS the last rose of summer Left blooming alone; (Yang is alone, Team RWBY split up)

All her lovely companions Are faded and gone;(they are not with her anymore not friends)

No flower of her kindred, No rosebud is nigh,(No kin is with her, No Ruby)

Read the rest and you can see where Im going.

Also i think that the 'Royal Test' is her desision on if she will be the heir of Schnee Dust or go of and live her own life. As you can see in RWBY she seems to have decided to be a Huntress instead of the SDC heir.