It's going to start with a 4, which is a big deal for a lot of consumers. Most Raptor owners are not Raptor enthusiasts who join the Raptor club and surf the Raptor forums and wear Raptor tshirts, most are just guys who like the truck.
Even though it doesn't make sense to us, many will be cross shopping against the other brands and it's difficult for most people to stomach a $50k truck, particularly when it's not one that gets the typical $10k, $12k etc "truck month all year" discounts. However these same people will option their Raptors well over $50k. Loaded out it will probably eclipse $60k.
This time around it's supposed to be more or less a full-volume truck just like any other trim of the F150 (e.g. Platinum, King Ranch, etc.) and a low base price coincides with higher volume. $50k is a big mental barrier.