I tweeted at City Watch when he posted the story about this but he's always silent on there. Found an old article that I remembered reading from right around the time of the Mancini sacking:
It is understood one potential shirt sponsor, an international financial services firm with their headquarters in the United States, were considering a five-year £25million-a-year deal but have dropped out of negotiations ‘because of uncertainties about where City are going, medium-term’.
<a class="postlink" href="http://www.dailymail.co.uk/sport/football/article-2326788/Manchester-City-struggling-new-shirt-sponsor.html" onclick="window.open(this.href);return false;">http://www.dailymail.co.uk/sport/footba ... onsor.html</a>
This could be a return of those negotiations or completely unrelated but it seems like we've been trying to get a different, and higher paying, shirt sponsorship for some time.