Package: aptitude Version: 0.7.4-1 Severity: serious 0.7.4 will migrate to testing soon, so this is a way to hold the migration. It is not very elegant and it would be nice to have another way to achieve this other than with changes in BTS, but I don't think that there are any.
The reason for holding the migration is because I think that 0.7.2 currently in testing is more "stable" than the new ones, and it's better to give more time of exposure in unstable to the changes in .3 and .4, some of which have profound implications, and the fixes or new features are nice to have but not urgent. -- Manuel