I don't fly in longhaul premium cabins very often, so my limited experience may not be too relevant.
However, on a BA B767 from TLV to LHR today, the WT+ seats were very comfortable and appeared to be fairly new. Service and food were both very good and seemed rather better than in WT. This was an improvement in all respects other than service from my experience a year ago on a 747 or 777 (or possibly one of each) on a trip from from LHR to NRT and back. The seats then appeared to be the same as in Club World in the early 1990s, and matched the rather tired look of the cabin.
If the 767 setup is now common across the BA fleet, then I will be quite happy with the BA product on a trip to SIN in a few weeks time.