It's pretty obvious that the Kizumonogatari movie will be the final entry of the Monogatari series.
And that's most likely more a decision of Aniplex/Kodansha than Shaft. You don't produce 41 episodes based on the other novels if you have any kind of production problems.
Yeah, I'm just poking fun at Shaft because of its reputation and because the Negima movie was (apparently) not very good and seemingly rushed. If Kizu is the last entry in the series, do you think the movie will start airing in Japan after the TV series is over? I think one of the anime charts I read said the new "second season" is two cours, so that would mean at least Winter 2014, right?