According to some intel gathered by blog TmoNews, the nation’s fourth largest carrier will introduce a “4G” HSPA+ mobile router in March of 2011. The router, which will be capable of speeds up to 21Mbps, will likely come in the form of a MiFi-like device. That’s about all the information there is to report at this time. We’ll hit up a few of our Magenta ninjas to see if we can scrape up any more information for you.