The TT 1:50K Look n Feel maps have been renamed to reduce/remove some of the confusion around the map resolution offered by them:
1. The maps without DEM data are now named TT HD Topo
2. The maps with DEM data are now named TT HD Topo Pro
Both maps are not a fixed resolution, they are dynamic, as you zoom in and out the amount of data shown changes.
The map style and detail offered is the same as before and they are constantly updated (monthly for most maps; the British Isles map is updated every week).
Both maps have the same raw map and contour data, the only difference is the inclusion of DEM data in the Pro versions.
If you don’t know what DEM is and why it is useful, read this page.