During the rental period, you get a full function license of ArchiCAD 13 and tech support -- no limit to the number of rentable licenses. Although the press release is titled "GRAPHISOFT's New Pricing Program," no prices are mentioned. I've asked press contact Akos Pfemeter about the pricing.
Update
Here is the price list:
Terms
Price per Month
1 Month Rental
$280
3 Month Rental
$233
6 Month Rental
$206
12 Month Rental
$182
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