This is significant news. Annie found it but don't blame her if the arc keeps going on and on and on. XD The Shounen Jump site has announced the end of the Arrancar Arc with the chapter that we just read where Urahara shows up.
click on Engl version on top right and you'll see the announcement:
[BLEACH]The end of "Chapter.Arrancars" appeared in WJ vol.43- SJ site.