#6 - Sept. 18, 2012, 9:42 p.m.
Hello Jhanz, your character's Honor points will not get reset on September 25th, 2012.
There is a full write up on how Valor/Justice and Conquest/Honor points will work in the weeks leading up to and after Mists of Pandaria's launch in the blog:
Currency Conversion Before and After Mists of Pandaria