Yeah. The 311 490 PLMN T-Mobile towers configured around me have opened access to all bands (some previously limited to B2 or B2/B4 only), but otherwise most T-Mobile towers are still only broadcasting 310 260 with no roaming access. Haven't seen any new 311 490.
I'm not convinced much has actually changed yet. It seems to me like they've opened up roaming a touch more, but otherwise Sprint customers are still on the Sprint network as much as possible. I have yet to connect to T-Mobile anything since the day of the merger.