I see on the line up of Smooth Jazz stations on iTunes that "The Oasis" is still described as "North Texas' only place for Smooth Jazz is 107.5-HD-2 The Oasis." But iTunes rarely update these stations. At least iTunes carries most of the former CBS Smooth Jazz stations that have moved to HD. That's Dallas, Houston and Detroit, plus the HD Smooth Jazz CBS created for 102.7 HD in NYC. Since CBS no longer is in Tampa, that Smooth Jazz HD station is gone, or at least gone from the iTunes list.
While listening on iTunes, I am hearing someone with a smooth African-American voice do brief promos saying "107.5 The Oasis is moving. We're now also heard on 103.7 HD-2." But he doesn't go into any details about why its moving or when the 107.5 feed will be discontinued. The other promos between the songs all say 107.5.
It's good that CBS maintains these Smooth Jazz stations. Considering they really don't bring in much revenue, CBS seems willing to keep them running. I know they're fully automated and I suppose the playlists are rarely updated. But somebody has to maintain them. And as mentioned above, 103.7 has a better signal than 107.5, so listeners with HD radios in the Dallas market can probably get the Oasis better now than in the past. I remember being in Dallas on vacation some years ago, when the station was still on the main 107.5 frequency and having a hard time getting it in my hotel room in the middle of Dallas.