I came across this through my G+ feed: http://ekaia.org/blog/2012/05/20/long-due-to-do-item-removal-of-qt3-from-deb...
I do not think this will affect Trinity much with its own (T)Qt3 packages, but it still seems relevant. I can imagine it may make it slightly harder to get Trinity into Debian in the future.
Best regards, Julius