Yep, that's a kieke!
When the roots get to be 3 inches long (preferably a few of them), then you can remove & pot it right up! Congrats to you, as a proud new momma!! Lol
IMHO, my suggestion for potting up your kieke (I say this from experience, & from seeing other's experiences with this), would be to use a media that is open, fast draining, & that dries quickly. LECA, or Lava Rock, etc would be best, (you can mix in some bark to help with holding a little bit more moisture, if need be) because the roots that will form on this kieke will be adapted to living in the air, and will still want/need a good bit of air to their roots. You may need to water a little more often (or just spritz the top of the lava rock/LECA, on a regular basis, and water by flushing say, once a week... *Give or take, depending on your conditions).
When a roots starts to grow, it adapts to the environment into which it grows (if you're familiar w/ semi-hydro, then you probably know why Ray says to repot only when new roots are starting). So changing that environment... say, from the open air (where they grew), to a damp sphag moss, (or even to moist bark, or CHC) can very easily lead to root rot... Because roots can't change once they've grown/adapted to their specific environment.. And when their environment changes, they have to grow new roots that are adapted to the new environment.
Sorry for the long-winded comment
I get excited over the little things in life too!! 
Good Job! 
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