They're planning a large ad campaign that was repeatedly referred to as "fun" and will almost surely be designed to poke at the other carriers. The idea T-Mobile is going for is "You love your iPhone, but you hate AT&T," the company told analysts, and even made vague references to proving pundits wrong and forcing news reports to issue "retractions" on their predictions.
Additionally, it was revealed that Deutsche Telekom will be spending $4.7 billion on network upgrades in 2013 and $3 billion in 2014 and 2015. $4 billion will be spend on rolling out its LTE network which is expected to reach 100 million people by mid-2013 and 200 million by the end of the year. Finally, the company expects to have regulatory approval for its MetroPCS acquisition in the first half of next year.
We'll have to wait until next year to see if T-Mobile will be able to execute on its lofty goals.