My understanding is that it is to give WC cars a play to race, but is open to any cars built to the rules.

My question is which WC rules will be followed? They change week to week, and allowances vary car to car. WC is a moving target over the years.

It won't be a cheap class, thats for sure!
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The VTS spec sheets for World Challenge cars doesn't change all that much in terms of items requiring extensive change. Most all changes involved 25 to 100 pounds of balast and and weight distribution changes of less than 3 percent, air inlet restrictor changes (5 or 10 percent at most) and boost changes. The Audi A4 and SRT-4 saw changes as the series came to grips with turbos in the touring car ranks but for the most part most cars were pretty static in terms of VTS specs for the last few years.

When has being competitive at the National level ever been cheap?