Ok, so it appears macros have changed again with 4.x.x.

1) Could someone outline the changes? (From what I gather here, the comma timing of /click and multiple /click in one macro is dead. Any other changes those of us who have been happily clicking need to know?)

2) Since it seems that /castsequence is what everyone is going back to for spam macros, what are the limitations on /castsequence? I remember it had some limitations, and that was why many of us went to /click macros, but I don't know what the functional limitations are.

3) For my hunter... I know there were several abilities that would never fire in a /castsequence, or would break the /castsequence, so any advice on building a BM hunter macro? I'm suspecting it will be two macros, one for the short-cooldown abilities (under 6 sec) and another or individual buttons for the longer cooldowns.