BigWaxer
Starter
If the proposal is similar to what has been hinted at, the sales tax would be for multiple public projects. Since it would not be specifically and only for a new arena, it would only take a majority vote, not 2/3s. That's apparently how it was done in San Jose.
I am not sure if I understood it the same way. What I heard (may be wrong it happens sometime

There would be two measures on the ballot, one for the tax increase and one that says "should the tax money be used for a new arena" Now don't quote me on that but thats what I thought was happening.