Hi, first MS stated that no camera updates come for other devices than 930,830,1520,icon. Second, I have O2 germany variant 64gb of 1020 which has Denim and nothing is new besides OS update which is the same as earlier on PFD. Also the freezing is still present on this, which on 8.0 was not.
No 1020 has Denim if Denim is the firmware. What can be said is:
a) No older Pureview device got "Denim" (OS update, or OS+FW update). Only O2 branded ones, like yours, got GDR1 (and a minor Cyan update). And it's not even the latest GDR1 (on the 520 etc. they got the latest version, which brings Cortana to continental Europe)
b) As you said in another post, there is more important Cyan update, being tested only on Finnish country variants (version bumps from 3051.50009.1424.xxxx to 3051.50009.1447.0001). This is supposed to be the freeze fixing FW. LumiaHelp, on Twitter, said early Dec, that "it is a Cyan update being tested in Finland ahead of Denim update"
c) Whilst I fully agree with you when you say Denim won't bring new camera features, it doesn't mean, though, it won't change anything camera-wise. For instance, there is a a bug since Black: the DNG files are not geotagged. Juha Alakarhu told me this is (finally) fixed with the next update. So even if we don't get Denim (or if we get Denim- or Cyan+), there will be changes camera-wise, maybe only bug/performance improvement.
Microsoft are obviously late for the Denim development (the real Denim, I mean, the one bringing Camera v5 to 830/1520/930). So whilst they rolled out Denim to only Nordic countries (930/1520), they also started to push GDR1 (and only OS) to older devices. Surprisingly, though, no older Pureview device (920/925/1020) got that GDR1 update, except, the O2 ones. Unlike non Pureview devices, it's a previous GDR1 version and the FW is still Cyan, barely incremented (minor change).
I do hope we ALL get that 1447 FW soon on our 1020, and that your branded device gets a second update (for both the OS, latest GDR1 version, and FW).