SPOILERS

Manga
Last released chapter: 418. Deicide 20
Incoming chapter:' 419

Anime
Incoming Episode: 287. Gaiden! Ichigo and the Magic Lamp
Last released episode: 286. Protect Karakura Town! Ichigo, towards the Real World!
Future episode titles
2010-09-07:
287. Gaiden! Ichigo and the Magic Lamp
外伝！一護と魔法のランプ
2010-09-14:
288. The Final Trump Card! Ichigo, Towards the Decisive Battle
最後の切り札！一護、決戦へ
2010-09-21:
289. Byakuya vs. Kenpachi?! The Melee Commences
白哉ＶＳ剣八？！乱戦開始
2010-09-28:
290. For the Sake of Justice?! The Man Who Deserted the Shinigami
正義の為に？！死神を捨てた男

Additional Information
Manga
The Arrancar arc will end in Mid 2010.
A short arc will follow; after that, a much longer arc will begin.