http://myanimelist.net/forum/?topicid=511559Quote (dtshyk)
Kawase Kohei, the producer of Warner Entertainment Japan, revealed in a web radio program that there will be an announcement at the end of the final episode of Little Busters!. He said "We know it's impossible to cover the whole story with the current pace. We have promised to animate the entire scenario of the game. I cannot make it clear here but you know what I mean, right? If you watch the 26th episode, there will be a message that you want. Please don't be suspicious. The arcs of your favorite characters will surely be animated. We know 26 episodes are too short."
tl;dr the series will probably get extended so that they wont have to cram everything into 26 eps