High School of the Dead Returns
If there is one anime that people keep saying "Hey Alicia, do you know if High School of the Dead is going to get a second season? That anime is kick ass!" well... the anime was named in the question. Now I can finally answer with "possibly". Still no solid green-lit for a second season of the hit zombie anime HSoTD buuuut after a 2 year hiatus the manga is finally returning to serialization via Dragon Age manga mag in Japan. This could only mean if the manga gets popular enough, or the demand for season 2 is just so overwhelming, we could see a second season by 2014. Fingers crossed.
[source: Sankaku Complex]
[source site is NSFW]