Sums up my thoughts on Tau in general.

I really wonder why a lot of people seem to hate the Tau for no reason at all..

Long range shooting, support fire, Hammerhead guns, MARKERLIGHTS.

but all that is why we love them so much <3

People at my store called them overpowered.....

You clearly haven't got any Grey Knights, Necrons or Heldrakes then...

They are powerful, but not overpowered.

So many Grey Knights....
There aren't any Heldrakes no because the only Chaos player is only just coming into this edition. Mainly its people failing at teamwork than actually being overpowered.

I cant wait to see the Tau in game, I will be so excited it could problably make another eye of terror and make another god (The god of Anticipation/Excitment?).

As for the farsight enclaves however, didn't Farsight and his loyal followers rebel against the ethereals? It just wouldn't make sense lore-wise if they made the farsight enclaves a playable faction/sub-faction.
I'm interested to see how they do the classes though, considering the Tau empire is comprimised of a MULTITUDE of races.

Lore wise Faresight enclave would not be added in a Tau faction, since they are actual rebels to Tau Empire, due to the death of Faresight's ethereal, making him going made... considering official Tau reports.

EDIT : a thread with my suggestion for a Tau Empire faction
http://forum.eternalcrusade.com/threads/tau-empire-possible-classes.1253/

Wanted subfactions :
- Tau
- Dal'yth
- Vior'la (my favourites )
- Fal'shia
- Sa'cea