We don't know. Maybe they wanted to try to product test Ethereum wallet working, maybe not. We just have to see what will happen. I don't believe it is a scam.
Why test with 180,000 ETH instead of 1 ETH? I smell a rat and so do lots of others. Kraken have just announced that they are coming back online shortly. I'm waiting for other announcements saying that there's yet another delay and a final one saying that funds have been lost.
Nobody in their right mind will ever trust Kraken again, they are finished!
I don't know. Kraken always delivered good quality and secure product. If they wanted to scam out, they would not take all the hassle like they did these past 2 weeks. It would have been more easy.
I also read your remark about getting back online shortly, but shortly in Kraken language means 'some time in the future'. We just have to see what will happen. There could be 10000 possibilities if I take in account al the crazy theories going on at this moment.