This is an announcement for the paper "A characterization of subspaces and quotients of reflexive Banach spaces with unconditional basis" by W. B. Johnson and Bentuo Zheng. Abstract: We prove that the dual or any quotient of a separable reflexive Banach space with the unconditional tree property has the unconditional tree property. Then we prove that a separable reflexive Banach space with the unconditional tree property embeds into a reflexive Banach space with an unconditional basis. This solves several long standing open problems. In particular, it yields that a quotient of a reflexive Banach space with an unconditional finite dimensional decomposition embeds into a reflexive Banach space with an unconditional basis. Archive classification: Functional Analysis Mathematics Subject Classification: 46B03 The source file(s), JZh10.tex: 38045 bytes, is(are) stored in gzipped form as 0702199.gz with size 11kb. The corresponding postcript file has gzipped size 96kb. Submitted from: btzheng@math.tamu.edu The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/math.FA/0702199 or http://arXiv.org/abs/math.FA/0702199 or by email in unzipped form by transmitting an empty message with subject line uget 0702199 or in gzipped form by using subject line get 0702199 to: math@arXiv.org.