There seems to be no pattern.
In IRC some people report their WD was canceled again.
Including some "shills". And some neutral members.
Many others got their.

The size also seems to play no role. Some over 1 BTC went through, some with 0.05 were canceled.

Looks to me more like First in / First out or random pick.

My last WD is still 'in queue' and my 1.5 BTC are still disappeared.
Several WD before and after mine got processed.
Guess I have made myself unpopular, hehe.