The Touch Lux 3 is basically a slightly updated version of the Touch Lux 2. it replaces the Pearl E-ink screen with the next generation Carta screen (but not the high-res screen found on the Voyage and Kobo Glo HD), but aside from that the Touch Lux 2 is virtually identical to its predecessor.
Both the old and new models run Pocketbook's software in a 1GHz CPU with 256MB RAM and 4GB internal storage. They feature similar broad format support, and Pocketbook's apps, and they each have a frontlight, touchscreen, and Wifi.
For all intents and purposes, Pocketbook simply replaced one screen with another. If you're looking for a novel ereader design, you're going to have to look elsewhere.
Weighing in at 208 grams, the Touch Lux 3 measures 114.6 mm by 174.4 by 8.3 mm. While there's been no official announcement from Pocketbook, this ereader is listed on Osiander.de for 99 euros, with immediate shipping.
All in all, this device is about as interesting as a wet balloon. I certainly don't see anything to make it worth getting. Instead, I'd suggest that you wait for the Kobo Glo HD. It's going to ship in another few weeks.
I've had a Kobo Glo HD review unit for about a week now, and I really like it. It's an awfully boring looking ereader but the combination of the screen on the Kindle Voyage and a $129 price tag makes for an appealing device.