As an FYI - I proposed the TIP because I was fixing a bug in forums which required incrementing forums to 1.0d1. While doing so, I saw that the requirement was for notifications 0.1, but the current version of notifications is 4.62 (now 4.64, Lars made another change).
So my only suggestion is - at the time of release - freeze everything - increment ALL dependencies of ALL modules to require latest (5.0) versions.
A little drift is OK, but I think a major release is a good opportunity to get all the packages up to the same watermark for the reasons stated earlier (encourage people to move forward, fewer version incompatibility bugs, etc).
