After spending a LONG time on hold, I finally got someone to talk to, and she confirmed that, while they sell the kit as KJV, that's only for the student guides and that the teacher guides have only been developed in ESV. 

Hmmm...most of the help I've gotten from them has been a direct email from customer service - are you sure you didn't get one?  Our pastor and the deacon board allow me some leeway in selecting our VBS curriculum from year to year, and I spend a lot of time researching our options, particularly between 2 different pre-approved publishers.  I'm pretty sure AiG will no longer be an approved publisher if this isn't worked out/answered.  I've spent several hundred dollars of our church's money on a curriculum that we now can't use several of the components or teachers have to do extra (as if they don't already do enough!) to make sure they are able to follow our constitutional guideline requiring KJV be used for all teaching and preaching ministries.  I was SO excited about this theme, but the reality is this segment of it is proving to be so extremely frustrating that I'm sorry I didn't choose another curriculum.

I second this! I bought the KJV kit and am just now hearing from my teachers that their books are in ESV.  I went to the USB to download a KJV book for them...and there isn't one!  To say I am incredibly disappointed would be the understatement of the year.