Warm grey usually designates a browner grey, where as cool greys ar ethe green/blue greys.  I already find Grey to be bluish and Dark Grey to be more green so Warm Grey would be just grey or a bronzer grey. 
 
Note in Obs pic how the lens looks bronze.  I thought it was a fade lens or bad printing when I saw it first. 
 
 
 
Now that I thought about it more, it's one thing to show an Oil Drum with an odd icon, but to show a Twitch in advertising that everyone who's seen it will want, why not release it?  Maybe it'll be the polar option or the early summer late commer to the line. 
 
I can see the little icons remaining too.  Dragon used to place a small D on the end of each stem.