According to Wiwo.de, the 2 companies will announce a new partnership at IFA Berlin next week. Txtr will run the European Asus ebookstore. It's going to launch this fall and initially cover Germany, Britain, Spain and the Netherlands. More countries will be added later.
Update: This has been confirmed. Txtr licensed their ebookstore platform to Asus.
I wonder what this partnership will mean for hardware? The Txtr ereader looks pretty much dead at this point, but if they integrated other devices into their platform, it could be interesting.