These have been requested for a long time, but apparently the big blue in france just never saw a need to comply to our wishes in this regard. Until now. According to WoR there'll be some level 80 and boss level dummies for us to test our DPS on. They'll be located in the sewers of Dalaran. Odd place, but these will prove quite useful in testing some item proc chances and personal DPS. It's unlikely they'll be able to help you in your weapon training much in the same way the servants in blasted lands will no longer give you weapon skill.
Hopefully they'll add level 60 dummies in orgrimmar, and level 70 dummies in shattrath as well. But I highly doubt it.
Also interesting, is that we've finally been given slightly more info on the glyph slots. As well as confirmation on the Glyph mastery spell.
Since Death Knights start at level 55, they'd have 2 Major and 2 Minor glyph slots.