According to the notice posted to regalia-anime.jp, it's cancelled after 4 episodes (h/t sage). Or at least that's how I read "第４話をもって、放送をいったん終了とさせて頂きます。" I don't recall a debacle like that recently. Even when Yamakan was booted from directing Lucky*Star after the same 4 episodes, the series continued.

UPDATE: Mr. Robert Gross pointed out that

[Regalia is] temporarily cancelled and they'll be reairing it from the start soon (next season?). Scheduling issue not allowing for sufficient quality, so it's more Garupan than Yamakan kind of deal.