I've heard there are new gun master presets, with different gun rotations, does anybody know if it's true? Server owners?

yep it's true, you can add the following modes:

normal ( as it always has been )
reversed ( last kill is still a knife )
light weight ( more PDW's etc )
heavy weight ( more assault rifles and machine guns )
Sniper's heaven ( Sniper only )
Pistol only
EU / US / RU arm's race ( only weapons made in those respective regions IRL )

Nice more gunmaster

id love to play GM on AM asswell

Awulle you've got to set your server to the new gun master rotations on AM, there are hardly any.
Played sniper's heaven today, it's a blast

i will

Been playing almost all afternoon on mah GM serva.

I think i like the heavyweight guns the most! Last kill is C4 kill

I like how in sniper heaven the first 5/6 guns are all supressed including 3/4 pistols.