Sekirei Season 3?
OMG FUNimation, you have to release season 3 soon! PLEASE!
It doesn't exist. They can't release what doesn't exist. Just sayin.
Also they don't make anime or control how many seasons are made. They are not in Japan, they're in Texas.
Yes, FUNimation does not make the anime. They secure the rights to distribute it to you, and put an English dub to it. Everything regarding the future of Sekirei depends on the Japanese production company that hold the rights to it. FUNimation can no more twist the arm of the Japanese creators to make more, than they could squeeze pineapple juice from the moon.
P.S. Glad you like Sekirei. Make sure you check out the forum for it.