UPDATE: T-Mobile announced today that it will announce its next Un-carrier move on Thursday, April 20th. The news will be released at 9 am PDT/Noon EDT. In addition, a promotional image shared by T-Mobile has the phrase "Let's Go" right in the middle which dovetails with the rumored new "Go5G" branding for T-Mobile's wireless plans.

T-Mobile promotes its next Un-carrier move for tomorrow at 9 am Pacific, Noon on the East Coast
The original story follows:
While it isn't known what additional features the new plans might have, one source mentioned by The Mobile Report suggests that there might be more international calling options. Another possibility is that the new plans might not include taxes and fees. As for the pricing of the new plans, when T-Mobile went from its ONE branding to Magenta, prices were the same before and after the change. While that could be the case here, we will have to wait for an official announcement to know for sure.

This Sunday T-Mobile could announce a major change to its wireless plans
Besides the "Go5G" plans, the sources have apparently mentioned a plan called Essentials Savings which might be a less-loaded discounted plan similar to the carrier's current Essentials plan. The report claims that there is a company-wide meeting scheduled for this coming Sunday, April 23rd which is when the new branding and plans could be announced. T-Mobile has broken big stories on Sunday before. On April 29th, 2018, a Sunday, T-Mobile announced that it was going to acquire Sprint.ncG1vNJzZmivp6x7sbTOp5yaqpWjrm%2BvzqZmp52nqHy1ecyomaKklWK7psOMm6mappSeu6h51qKpnqSVqMBuvMuapayXmZl%2BdYKYcWg%3D