So is it still July 25th-31st? I'll need to arrange for some time off (as well as a ride) as far in advance as possible.

Thanks.

At this point in time, yes.
My only real concern right now is the number of vehicles attending and the impact on Wheeler Lake on the first night. I'll be checking with the Forest Service about that issue. The rest of the camping spots I've chosen can accomodate large numbers of people spread over numerous sites.