I'm pretty sure the 2015 FRS key will be the exact same as the bog standard Toyota key fob they've been using in the previous FRS and all recent Toyotas like the Camry, Venza and the base BRZ. Unless Toyota is phasing out that key the only other option is the key fob will be like the ones used on the Yaris and RAV4. Basically nothing out of the ordinary.
Basically this.
Or this.
