Just some quick replies. AFAIK;
- No. One cluster with two nodes
- No. As long as you buy licenses, you can configure nodes. No of cores doesn't matter in QlikView.
- Talk to your partner. This may be customer-dependent.
- You'll need an additional license. QlikView Test server/publisher licenses are specially made for this purpose and way cheaper.
- It means what it says. So no, license-wise you're not allowed to place your second node in another geographically separate data center although it may be physically possible.
The best thing you can do is talk to your partner. Qlik has tailored answers for demanding environments. Information from the communicaty won't be a good reference to draw conclusions about non-standard situations.