Redundancies from 7.x-2.x-dev were eliminated. This version has the same feature: users can create multiple TARDIS blocks and pages, and even assign date.module fields and languages for filtering on each.
There is no upgrade path. If you decide to upgrade the module, first write down your settings so you can create a new TARDIS block and/or page accordingly.
Sorry for that: too much has changed since 7.x-1.x and I didn't want to delay this release any further - I spent about a month studying and developing!
And as always
Backup your site. TARDIS doesn't hold the power to break your Drupal installation, but nevertheless it doesn't hurt to have a backup ;) also report any bugs you may find. thanks!