Yup. My area's been using IJS as far down as Pre-Juv and Preliminary. So far it's only been trials with them using it one year and then switching back to 6.0 the next year or waffling between the two. The competitions that use IJS for the lower levels already have the IJS systems present for Juv and up, but use fewer judges for the lower level skaters.All US qualifying competitions use IJS beginning at Juvenile (two levels below novice).
Most nonqualifying competitions also use IJS beginning at Juvenile.
If a nonqualifying competition is not going to use IJS for juvenile and intermediate, they're probably not going to use it at higher levels either. Either they have the system and personnel on hand and would use it for the most populous qualifying levels (juvenile and intermediate) or they don't have the necessary officials at all.
In my area, some have been offering it for Pre-Juvenile, to introduce the kids to the more demanding system before they get to qualifying levels. I understand that many competitions in California have been using a version of IJS for even lower levels, and that this will probably become encouraged nationwide in coming years.
I'm not sure what MacMadame was really talking about.
My understanding is that at least in synchro they're slowly phasing out all 6.0 judging beyond the basic levels. I'm not quite sure why, but I would assume it will help skaters learn IJS stuff earlier. Also it probably makes sense time-wise and financially to train new judges in one judging system, and since IJS is more widely used now that would be the obvious choice. I don't know if they're attempting this in singles/pairs/ice dance yet, but given the IJS trials for lower levels its entirely possible.