Reuben was born in Alabama and has been an Alabama fan most of his life. I don't see him changing his committment.
It seems Saban likes stud 5-star players committing very early in their recruitment. Trent committed very early on (I know he had a press confernce on NSD and re-affirmed), Eddie Williams/Ragland in the 2012 class and Reuben for 2013. It looks somewhat like a Saban formula but I may be stretching it.