Some Questions re: Aztlan, Reading the sourcebook and going 'huh?' Options

[Velocity]

Okay, so I just acquired a copy of Atzlan and I'm reading it slowly, parsing it for useful (pay)data. Several topics are completely new & foreign to me and--even after skimming Unkie Ancient's datahaven--I'm left scratching my noggin.

Some help(*)?

1) Does anyone have any further intel on the foveae? They're described as "blind spots in the mana flow," geographical areas of dead astral space. Mages who assense these areas "sometimes go mad or even die as a result of the experience." Sounds like localized mana warps to me, but what's causing them? Ehran the Scribe (posting as "Wordsmyth") seemed mightily perturbed at the news of these things and that just hikes my curiosity even higher...

2) Who is Brightlight? The inner circle of self-important muckity-mucks who play peanut gallery throughout the text(**) make frequent reference to this individual.

3) For that matter, who's Jungle Cat? I gather they're a jaguar shapeshifter involved with the Amazonian resistance, but does anyone have any more concrete info?

4) I'm probably gonna fraggin' regret asking this, but here goes: what the frag are the tzitzimine? Aside from "demons," natch.

Thanks in advance for any help! :)


* (all quotations are from the Atzlan sourcebook)
** (Lady of the Court, Hecate, The Laughing Man, The Big 'D', Wordsmyth, Jungle Cat & Umsondo)