Board Thread:Episode Discussion/@comment-410526-20160521092501/@comment-6533159-20160522010830

Yep, this episode basically confirmed the "Cross magazine" was in fact Gravity Dust/Bullets.

I remember Monty hinted at it saying something along the lines of "Hmmm what could it be?" with a picture of the "Red" Trailer (This one: http://rwby.wikia.com/wiki/File:1001_Red_Trailer_5590.png).