While we have no direct confirmation, I believe we will get a 4.6, though it will function as a smaller main patch. My working theory is the next tier of Omega will follow FFVII and Omega will be a separate encounter released in 4.6. The reason being is people complained quite a bit at how long Creator lasted, thus a smaller tier would give people something else to focus on while we wait on the expansion. No new gear or anything. Just a fight to close Omega and perhaps more MSQ.