I've issued a pull request to change the release schedule of 2.6.
There are two motivations for this -- the first is that I wanted to get the Boxlib stuff and Cython kD-tree included by 2.6, but I don't think we will have time between now and July 1 to finish, review and test these changes. The other is that in the old release schedule I was set to be the coordinator for 2.6.1 on August 1st, but I am somewhat skeptical I'll be able to do so. So someone else will be set up to be release coordinator for 2.6 and handle pushing it out on August 1st.
This would give the entire month of July to finish up Boxlib / Cython kD-tree, but still retain a 2.5.4 (new) release on July 1, to include changes since 2.5.3.
Please feel free to click "Approve" on the PR if you are okay with this, and if you're not, either reply here to leave a comment.