This is an announcement for the paper "Minimality properties of Tsirelson type spaces" by Denka Kutzarova, Denny Leung, Antonis Manoussakis and Wee Kee Tang. Abstract: In this paper, we study minimality properties of partly modified mixed Tsirelson spaces. A Banach space with a normalized basis (e_k) is said to be subsequentially minimal if for every normalized block basis (x_k) of (e_k), there is a further block (y_k) of (x_k) such that (y_k) is equivalent to a subsequence of (e_k). Sufficient conditions are given for a partly modified mixed Tsirelson space to be subsequentially minimal and connections with Bourgain's \ell^{1}-index are established. It is also shown that a large class of mixed Tsirelson spaces fails to be subsequentially minimal in a strong sense. Archive classification: Functional Analysis The source file(s), SubseqMinimal8A.tex: 107238 bytes, is(are) stored in gzipped form as 0702210.gz with size 27kb. The corresponding postcript file has gzipped size 176kb. Submitted from: matlhh@nus.edu.sg The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/math.FA/0702210 or http://arXiv.org/abs/math.FA/0702210 or by email in unzipped form by transmitting an empty message with subject line uget 0702210 or in gzipped form by using subject line get 0702210 to: math@arXiv.org.