Just because you want it, does not mean it will happen.
They have already stated there will be a pre-expansion event. There could be a new raid in that, However it is extremely unlikely that it will be another tier, As it is generally 3 tiers of raids per expansion. Only vanilla, and WOTLK broke this with additional filler raids. The best you can hope for is a single boss event, like Ony, RS, OS, Malygos, with gear on the same level as SoO