Im used to belivie that a cloth wearer is not a tank, but i guess ill get used to this.
Leather. Exact same gear as druid tanks, so nothing has really changed. There have been both plate and leather tanks since vanilla (though ferals didn't become seriously viable tanks until TBC).
Hmmm.. i think that monks and rogues are a bit similar, especially in pvp, just had an idea to change the colour of the bar, maybe to a little more yellowish orange.
EDIT: On brewmaster monks.
If you look back, originally they were not going to have any main resource just cooldowns that generated light and dark chi to use for certain abilities but they scrapped that idea early on in the alpha.