TBP library's standard set of Boxes are built and tested against Drupal's Panels 2 module. Currently, users who are using Panels 2 will be able to use them without any compatibility issue.
However, because the developers at Panels has announced that there won't be any more commitment for Panels 2, and efforts are channeled towards Panels 3; TBP will modify the Boxes' code accordingly for full compatibility with Panels 3 when Panels 3 is stable. Preliminary examinations showed that Panels styles directory was moved down a level under a new directory called "plugins". A minor path adjustment in the .inc file of the Box is sufficient.
In short, Panels 2 users do not have to worry about anything at all. TBP will wait until Panels 3 is stable, and examine what is the best path to take. For normal Html users, there is no cause for worry. This discussion affects the Panels users.
