This is an announcement for the paper "Unconditionality of orthogonal spline systems in $H^1$" by Anna Kamont and Markus Passenbrunner. Abstract: We give a simple geometric characterization of knot sequences for which the corresponding orthonormal spline system of arbitrary order $k$ is an unconditional basis in the atomic Hardy space $H^1[0,1]$. Archive classification: math.FA Remarks: 31 pages Submitted from: markus.passenbrunner@jku.at The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/1404.5493 or http://arXiv.org/abs/1404.5493