Looking to the previous year I cannot see this "critical mass" of candidatures!
About the members of board you have the correct reading because if an US, Dutch, German o French candidate will be chosen is natural that the decision is not trasparent.
1.Any member of the jury must NOT be involved in any way with the bidding town.
This isn't practical. There would be very few people who are able to be involved if everyone from 20 or so countries that submit bids can not be on the jury. The Board members are usually on the jury, so you're implying that the US, France, the Netherlands, and Germany can not even submit bids?
To have a transparent decision is better to have un-transparent members (the names will be public after the decision). It seems a paradox but if we need transparency it could be better to know also the vote of any single member. Why in this case there is not problem of transparency?
2.The name of any member of the jury must be secret until the final choice
I disagree with this. For transparency, everyone should know who is making the decision and how that decision is made.
As a reminder, the draft Judging criteria are still at http://meta.wikimedia.org/wiki/Wikimania/Judging_criteria
Ilario