I'm thinking/hoping that it won't come up often, due to rarity.
In the Aion community we had/have a "plastic surgery ticket" that you could purchase from the cash shop that allowed you to change everything but your gender, it had an in character presence via the "Daeva of Appearance". Opinions varied about whether or not it was a good thing, but thankfully when it was used IC most of the time it wasn't done so lightly. I suspect a lot of people RP the race/gender that they want to RP, and as a result won't be quick to change things around IC.
If anything we'll mostly see the occasional "oh, no! this alchemy accident turned me into a boy/girl! what do I do!?" sort of event, but that will likely be uncommon too.
Regardless, it's not as if you can stop people from using it IC, so expect it to happen.
In the Aion community we had/have a "plastic surgery ticket" that you could purchase from the cash shop that allowed you to change everything but your gender, it had an in character presence via the "Daeva of Appearance". Opinions varied about whether or not it was a good thing, but thankfully when it was used IC most of the time it wasn't done so lightly. I suspect a lot of people RP the race/gender that they want to RP, and as a result won't be quick to change things around IC.
If anything we'll mostly see the occasional "oh, no! this alchemy accident turned me into a boy/girl! what do I do!?" sort of event, but that will likely be uncommon too.
Regardless, it's not as if you can stop people from using it IC, so expect it to happen.