Not sure why you (minimiri) were banned, but I'll quote you from a deleted message.
I've been pointed to this topic so I will reply. As with all updates, 5.4.8 MoP update may introduce new issues, while resolving others and it is also an inevitable logical upgrade to the latest patch of Mists of Pandaria - the more we would've worked on 5.4.0 the more work we would've had to re-do for 5.4.8 update. Mists of Pandaria has already started having developers switch to it from Lordaeron as its Wrath of the Lich King content is about to be launched.
Untrue. The only reason why Deathwing and Ragnaros have not been updated to Lordaeron's core is because the core hasn't been "run through" (tested) extensively enough for performance, stability and end-game content (that great majority of players are farming on Deathwing and Ragnaros) yet. Lordaeron's Wrath of the Lich King release is upon us, and with it we will start revising its end-game content (while it will remain closed on Lordaeron itself with respect to progression) in preparation to update Deathwing and Ragnaros in Q1 2016 (we're aiming for February 2016, but don't quote this as an official estimation).
As it was stated, our priorities had been mainly on Wrath of the Lich King, specifically on developing Lordaeron and its core eventually improving Deathwing and Ragnaros to new a new, long-due, superior experience. Warmane had to make a choice to focus on an expansion and to deliver quality, rather than being jack of all trades, ace of none. That said, and as mentioned above, we've started to switch more manpower to Mists of Pandaria in preparation for its 5.4.8 update. Frostwolf's Mists of Pandaria 5.4.8 update will be launched after Lordaeron's Wrath of the Lich King update. This is due to some more development being required on it in terms of avoiding deteriorated end-game (Throne of Thunder as you mentioned) experience, what you said about 'Throne of Thunder has to be rewrritten from scratch' is untrue and far fetched, as of this moment I asked QA for an update on this and the up-to-date information is that Jin'rokh the Breaker, Horridon and the Council of Elders have some bugs issues while in general all bosses have a certain issue that require an internal core update.
Hopefully this information cleared some misunderstanding and rumors.