I don't think we'll see this in 3.1. It was supposed to be with Wrath when it was released, but we still have yet to see it and there has been no mention of it with the 3.1 changes (even in undocumented changes).

As for the glyph of living bomb - Even if it's a dps increase, it may still be worth very little if worth using at all since it would either have to be better than glyph of molten armor and glyph of frostfire/fireball (depending on whether you're fire or ffb). If it's not, then it's simply an option for an extra fire/FFB mage that isn't on scorch duty and therefore doesn't need the scorch glyph. Even then, do these crits count towards hotstreak? If so, do the non-crits mess up the 2-in-a-row crit rule needed for hotstreak?

I also don't see where you get too optimistic about glyph of mirror images. If you're fire or frost, then this is simply a potentially faster way to apply your spell crit debuff (since there's no reason it would stack). If you're arcane, then you have a very short application of a debuff your raid should be bringing anyways. Let's not forget that in patch 3.1, mages won't be the only class that can bring this type of debuff.