While we were expecting that the level 90 boosts may appear sometime after the patch's launch, we weren't thinking that they would crop up today before the pre-orders even went out. And we certainly didn't think they would be priced at $60.
It seems likely that this is not intended to be up yet, given that pre-orders are not live, so there is a possibility that this is a test number. A member of WoW Insider staff, Matthew Rossi, was able to log on and see this on his server, between restarts. Whether it will still be there when servers come back up later today remains to be seen.
This is a far higher price point than many were expecting, but that can be viewed as a good thing or a bad one. A good thing because it puts the price on leveling at a point where the work that goes into a 90 still has value, a bad thing because it's expensive.