Take out of that what you will. Personally I doubt Adobe will drop XP support for their Creative Suite yet but the writing is on the wall and it don't look good, Belshazzar.
Just remember, the Lightroom team is really not the same as the Photoshop or InDesign teams, and Lightroom is a much less mature product. It doesn't have a huge installed base of large enterprise clients who care a lot about compatibility with older OSes. It is much easier for Lightroom to drop XP than it is for the Creative Suite products.