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I can confirm the split; I recently spotted a small box of JUST gaunts (I forget what type, but it was only 8) in a local store here. I think this is probably good news given the increase we'll see...

There are actually some special rules for IG regarding Kill Points in that situation.

I'd be surprised if all or even most of the models changed.

In the codex, under the section for lurking (bold added for emphasis):

"Alternatively the brood may Lurk. This means it will remain stationary that turn but may fire its weapons as normal. Lurking...

Sorry :).

Also: while I'm glad they clarified the issue, it seemed kind of silly that allies would receive the benefits of the orders. Why would the sisters receive the same training as an...

Lurking Gaunts do not count as scoring. (It's in the Codex)

I've found the while it's fine and dandy to give Zoanthropes Psychic Scream or Warp Blast, you HAVE to give them Synapse if you're running Gaunt heavy.

Also, as others have said, splitting them...

The Imperial Guard FAQ is up on the GW site, and it's been clarified: Allies are NOT allowed to receive the benefits of orders. Only non-vehicle units from the IG codex may receive orders.