Alright, in your opinion, out of the six questions in the current version of the OP, which have been answered/explained? Here is what I think:

Question: how does ZenPool achieve its profitability?
A: Claimed to be mostly derived from private rentals. I think we can dismiss other suggestions like Scrypt-N (negligible network capacity), day trading (highly unlikely to achieve the volume, profitability, and consistency of hashlets). BTC mining is also questionable, since there was no corresponding drop in profitability after the recent difficulty increase, but that could perhaps be explained by more hardware being allocated to each hashlet. Unknown if Scrypt mining is any part of it at all.

Question: where is ZenPool's hashrate?
A: Unknown? I mean even if it's private rentals it should still be showing somewhere? ZenPool hashrate has been removed from the website.

Question: How are customers' funds being used and secured? (deposits earning interest)
A: Unknown.

Question: is GAW mining on any pools other than ZenPool?
A: Almost definitely not.

Question: Is the Hashlet its own hardware device?
A: Probably not, no more mention of "proprietary hardware" that I can see. There is the "virtual software" aspect, which I'm still not sure how to interpret.

Question: Is the Vaultbreaker, GAW's 750 MH/s "Titan killer", still on track to be delivered in Q3/Q4 of 2014?
A: Unknown.

Let me know if missed/misunderstood anything. AFAIK there is also another announcement coming up soon, so maybe I'll update after that.