A colleague made me aware of the following article (in German only):
In short: The Russians have bought new Talgo trains that will operate between Berlin and Moscow. The nice thing about these trains is that they have an automated way of changing the axis width, which is necessary when crossing the border from Poland to Belarus, due to the wider rail tracks in Belarus and Russia. The journey is thus shortened by about two hours.
Having made this trip last December with an old version of the train, I don’t know if this is positive or not, since I quite enjoyed watching the process of changing under-carriages in Brest (no photos allowed…)!