If you notice, that is the "Classic Plans". My understanding is that 3rd party resellers, because of the way they are paid, have to be able to sell postpaid plans, so the Classic plan will remain postpaid with the "free phone". This is the reason the plans are roughly $20 more per month, to pay for the "free phone".
When you purchase a plan/phone from T-Mobile directly, it is rumored they will not sell plans with subsidized phones. Instead, the base price will be $70/month for unlimited everything and if you want a "free phone" they will sell you a phone with a no-interest loan, which will add $15 or $20 extra a month. It is unclear if those will all be prepaid plans, or if they will still offer postpaid directly.
Last, the rumors I've heard are that the $30 plan will still exist, just that it is not considered a "T-Mobile" plan since it is exclusive to Walmart and online.