We've known for a while that a MetroPCS-friendly version of Samsung's Galaxy S 4 was in the cards, but the carrier hasn't been very forthcoming with its plans. At least, until now -- the company just posted a teaser on Twitter for a Samsung-based launch next week. While the text is slightly cryptic, the mention of a Galaxy S III "+1" makes it quite clear that the 2013 Galaxy flagship is what's on deck. This variant won't have HSPA for the T-Mobile network, at least if it's anything like what we saw at the FCC, but it should include LTE support. Let's just hope that the phone ships quickly -- MetroPCS customers have been waiting long enough.