Not to be crude, or anything, but it doesn't quite matter whether or not eAthena follows iRO or kRO, talking about your updates iRO is supposadly making, which I haven't seen on iRO, seeing as I play iRO. O_o But I guess I could have missed it somewhere, which I don't think I did, either way, kRO is always going to be more updated than iRO to begin with. For example, kRO Sakray has four out of then seven 3-1 classes activated and working, and iRO hasn't even really begun Renewal yet, they just got Satan Morroc implemented on iRO. Also, I haven't seen anywhere under the eAthena forums that they've suddenly transferred eAthena from working off of kRO, and went to working off of iRO, seeing as they're still basing their updates off of kRO, and only mentioned the transfer of iRO to the beginning stages of Renewal.
Either way, like yC already stated, RMS is run based off of what eAthena is run, so I'm sure it'll get changed if and when eAthena actually changes from working off of kRO (which I doubt would ever really happen, unless iRO randomly becomes more updated than kRO, which is near impossible, seeing as iRO gets what they have off of kRO.)