Been meaning to post this since I saw them added (and I do not yet have them as the RNG gods hate me and my loot roll dice so this is based on raw data from the clone) I am not sure what purpose they are filling exactly. I took a look at the Rk1 versions for all 3 mage direct damage spells and in almost every regard the bolt is better to my eyes. In DPS, DPM raw damage and resist check (-170 on bolt -75 on the other two) for sure, the fickle recourse is nice, but I don't know how it exactly compares to the swarm pets from the bolt.
Comet has a nice fast cast compared to the other two, Fickle has the recourse, but bolt has so many advantages over the other two. Maybe I'm missing something.

Bolt of flaming Stone -
webtools/spell.php?id=9297Fickle Inferno -
webtools/spell.php?id=4753Comet Strike -
webtools/spell.php?id=4750