As per #ubuntu-release:
15:11:09  cjwatson | didrocks: https://bugs.launchpad.net/ubuntu/+source/colord-gtk/+bug/1282372 - colord-gtk is currently on the list 
                   | to move (back) to universe.  Did the reverse-dependency in question never happen, or get reverted, or something?  
15:11:09     ubot2 | Launchpad bug 1282372 in colord-gtk (Ubuntu) "[MIR] colord-gtk" [Undecided,Fix released]                          
15:11:55    seb128 | cjwatson, didrocks: the new panel codebase ended up having other issues and we decided to delay the update to next
                   | cycle                                                                                                             
15:12:03    seb128 | cjwatson, didrocks: it can be demoted                                                                             
15:12:41  didrocks | seb128: hum, so the "we'll seed it soon" was forgot to mention it needs demotion I guess                          
15:12:43  didrocks | ok, demoting now                                                                                                  
15:12:47  cjwatson | thanks                                                                                                            
15:12:51  didrocks | (and reopening the bug)                                                                                           
15:13:02  cjwatson | It can sit as Fix Committed or whatever, I guess.                                                                 
15:13:09  didrocks | yep                                                                                                               
15:13:31    seb128 | didrocks, sorry about that, miscommunication with robert_ancell I guess (those happen with the little of tz       
                   | overlap we get)                                                                                                   

$ ./change-override -c universe -S colord-gtkOverride component to universe
colord-gtk 0.1.25-1.1 in trusty: main/graphics -> universe
gir1.2-colordgtk-1.0 0.1.25-1.1 in trusty amd64: main/introspection/optional/100% -> universe
gir1.2-colordgtk-1.0 0.1.25-1.1 in trusty arm64: main/introspection/optional/100% -> universe
gir1.2-colordgtk-1.0 0.1.25-1.1 in trusty armhf: main/introspection/optional/100% -> universe
gir1.2-colordgtk-1.0 0.1.25-1.1 in trusty i386: main/introspection/optional/100% -> universe
gir1.2-colordgtk-1.0 0.1.25-1.1 in trusty powerpc: main/introspection/optional/100% -> universe
gir1.2-colordgtk-1.0 0.1.25-1.1 in trusty ppc64el: main/introspection/optional/100% -> universe
libcolord-gtk-dev 0.1.25-1.1 in trusty amd64: main/libdevel/optional/100% -> universe
libcolord-gtk-dev 0.1.25-1.1 in trusty arm64: main/libdevel/optional/100% -> universe
libcolord-gtk-dev 0.1.25-1.1 in trusty armhf: main/libdevel/optional/100% -> universe
libcolord-gtk-dev 0.1.25-1.1 in trusty i386: main/libdevel/optional/100% -> universe
libcolord-gtk-dev 0.1.25-1.1 in trusty powerpc: main/libdevel/optional/100% -> universe
libcolord-gtk-dev 0.1.25-1.1 in trusty ppc64el: main/libdevel/optional/100% -> universe
libcolord-gtk1 0.1.25-1.1 in trusty amd64: main/libs/optional/100% -> universe
libcolord-gtk1 0.1.25-1.1 in trusty arm64: main/libs/optional/100% -> universe
libcolord-gtk1 0.1.25-1.1 in trusty armhf: main/libs/optional/100% -> universe
libcolord-gtk1 0.1.25-1.1 in trusty i386: main/libs/optional/100% -> universe
libcolord-gtk1 0.1.25-1.1 in trusty powerpc: main/libs/optional/100% -> universe
libcolord-gtk1 0.1.25-1.1 in trusty ppc64el: main/libs/optional/100% -> universe
Override [y|N]? y
19 publications overridden.