The best Red vs. Blue season is season 5. It is the most funny of'em all (besides reconstruction, or whatever it's called).
Red vs. Blue Revelations
Burnie Burns, the director of red vs blue has said before that he will continue to make red vs. blue even if there are only a few fans left. So yes, there will be a red vs. blue season 11
Season 6
Yes
Mark Bellman has: Performed in "Red vs Blue: Recollection Trilogy" in 2008. Played Delta in "Red vs. Blue: Reconstruction" in 2008. Played Delta in "Red vs. Blue: Revelation" in 2010. Played Delta in "Red vs. Blue Season 9" in 2011. Played Delta in "Red vs. Blue: Season 10" in 2012.
Red vs. Blue Season 9 - 2011 was released on: USA: 15 November 2011 (internet)
There is Relocated,Recreation and then Season 9
No, season 10 will not be the last season to Red vs. Blue. Season 11 will most likely becoming out this year (2013), and Halo 4 will probably be used to make the episodes.
Recreation
It already has.
On iTunes, there is that same song, but with lyrics. It is called "Red vs. Blue Theme" I think. you might wanna play the preview before buying it