Finally downloaded it. Once you open Lightroom cc from the Creative Cloud app you then have to wait for the catalogue to be upgraded, which is fair enough and doesn't take that long.
Once Lightroom has opened you find the usual features, with the new ones hiding in there too! I dived straight into HDR Merge, and attached is the first image.
The problem I found was that after doing the HDR merge Dell ran at70-90%, making it much much slower, which is hugely disappointing. Maybe I just don't have enough memeroy??
Anyway the first go with HDR Merge (speed aside) was great. There are a few things that can be improved with time and practise, but now I will have a quick go at a vertical panorama, and see if my PC can handle that.