Halo 4?

So i have been hearing numberous of rumours about Bungie is making Halo 4. I really don't know if its true , because the Halo 3 ended in a strange way...seem like there will be no Halo 4.
I did some research on that topic, many sites informed me that bungie its working on the Halo 4 project. If its true, that would be amazing. Halo 3 is already outstanding, so i can imagine is going to be a blast. Probly will take them another year to finish it up(if the rumour is true). I am sure Halo fans out there are exicted. I will keep posting blogs about Halo 4 to keep you guys updated