According to Hokkoku Newspaper, a new anime of Hanasaku Iroha was announced at Yuwaku Bonbori Festival. It will be released in 2012.

Yuwaku Bonbori Matsuri official website

“Bonbori Festival” was originally an imaginary festival in Hanasaku Iroha anime. The tourist association of Yuwaku, the model spa of Hanasaku Iroha anime, reproduced the festival with the anime producers in order to promote the spa. About 5,000 people visited the spa during the festival and filled the main street.

Source: Hokkoku Shinbun

Update March 22nd
According to the official website, the title of the new anime was announced to be "Hanasaku Iroha - Home Sweet Home".

Key illustration of the new anime

According to the cover note of the manga, the new anime will be released this year.

Source: Scan of the cover note

Update May 21st
According to Monthly Gangan Joker, Hanasaku Iroha - Home Sweet Home is planned to be a movie to be released within 2012.

Source: Yaraon (Japanese)

Hanasaku Iroha: Home Sweet Home on MAL