I found the original press release from Netcarshow.com, says this:
"With regard to the axle concept, Audi relies on a MacPherson axle with bottom wishbones at the front. Models with an output of 110 kW (150 PS) and more are equipped with a four-link rear suspension with separate spring/damper arrangement. Engines with an output of less than 110 kW (150 PS) are equipped with a light and compact torsion-beam rear axle." It's the same for both variants. It may be possible they just decided to axe the torsion beam at some point to reduce different parts to deal with but I haven't heard of it before.
"With regard to the axle concept, Audi relies on a MacPherson axle with bottom wishbones at the front. Models with an output of 110 kW (150 PS) and more are equipped with a four-link rear suspension with separate spring/damper arrangement. Engines with an output of less than 110 kW (150 PS) are equipped with a light and compact torsion-beam rear axle." It's the same for both variants. It may be possible they just decided to axe the torsion beam at some point to reduce different parts to deal with but I haven't heard of it before.