This link will show all differences in the theme files. It might be of help? Red is removed, green is added.
https://trac.buddypress.org/changeset?old_path=/tags/1.2.5.2/bp-themes/bp-default&new_path=/tags/1.2.6/bp-themes/bp-default/
To clarify, the above link shows changes in the bundled “BP-Default” theme, and it was intended for any theme designers who have created a BP-Default child theme to help pin-point the changes. It won’t apply to any other theme. Sorry for any confusion.
EDIT: third time’s the charm
