is there available any documentation (tech specs, data sheet, white paper, etc...) about EX-8200 series switches?
does anybody knows if it will support virtual chassis technology or something similar?
Public documentation for the EX is available here http://www.juniper.net/products_and_services/ex_series/index.html
There are white papers, specs etc.
Plus the public technical documentation is linked from that page, or if you want a direct link its at http://www.juniper.net/techpubs/en_US/release-independent/information-products/pathway-pages/ex-seri...
Hope that helps.