During today's Telekom press conference, T-Mobile also revealed some information about its future music plans. While nobody was talking about it too detailed, iTunes appeard on one of the slides which were presented: "from Christmas also mobile with iTunes".
This means either, that a) T-Mobile will introduce the Motorola iTunes phones or b) you can access the iTunes Music Store from your any T-Mobile music enabled phone.
I expect that T-Mobile will introduce the Motorola iTunes phones but who knows, right from the slide it's not crystal clear yet:
Whatever T-Mobile plans on the music front, it plans something massive.
Cheers ~ Arne