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[i_amtrunks]

Apparently some episodes were leaked... then they kind of stopped releasing them? how good was Firebending Masters though??

Not leaked as such, but they aired in Canada, and not in the USA, the USA finished airing at the conclusion of "The Black Day of Sun part2".

It would be nice if they did another season... doesnt have to revolve around Aang, could be a new avatar huh?? or maybe the avatar cycle is broken? or its in the future??

The idea of a new series with new characters has been bounced around, but I don't know if they have plans for it or not.
The Avatar cycle is technically already broken, unless Aang can find a bunch of hidden Airbenders to continue to teach, otherwise after he passes away there will be no Airbender to teach the next Avatar.

The fighting is choreographed by professionals, with certain bending styles having certain styles attributed to them:
Waterbending= Tai Chi
Earthbending= Hung Gar
Firebending= Northern Shaolin
Airbending= Bagua
More detailed information can be found here.