Anime News Network have reported that the J-Rock band "ROOKiEZ is PUNK'D" (Known for "Complication", the second opening theme of hit anime "Durarara!!") posted a message on their blog that their new song "Song for..." will serve as a fitting ending theme for Bleach's final season. "Song for..." had recently been confirmed as the new ending song for Bleach, yet, this comment was quickly removed.
With the "Bleach" anime quickly catching up with the manga source material, it is likely that the series is doing what the anime "Gin Tama" did recently; going on hiatus for just under a year to allow the manga to catch up. As it stands, the manga is only 18 chapters ahead of the anime, with each episode being comprised of 3-4 manga chapters worth of story; so the producers probably didn't predict a lengthy filler arc to be worth the production costs.
This final season of "Bleach", known as the "Deicide Arc" (As the titles of all the chapters in this mini-arc preceeded their title with "Deicide" and then a number) comes just before a timeskip in the story.