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The 5th installment of the Halo series, and the second in the new trilogy. Though it hasn't been released, probably has not been worked on, or even been officially confirmed, 343 Industries said Halo 4 would be the first in a new trilogy. Trilogy means 3.
OMFGGGGGGGGGGGGGG HALO 4! *bounces off the wall*

*Hears there will be a Halo 4, Halo 5, and Halo 6* *Blows up*
by SpitShine Tommy July 21, 2011
37 5
Will be made in the year 3000!!
Halo 5 will be out when I am dead
by Naikoe September 10, 2007
45 119