The snom ONE comes in three editions, snom ONE free (up to 10 extensions), snom ONE yellow (up to 20 extensions) and snom ONE blue (unlimited extensions and multi tenant up to 5 companies).
Please see http://www.snom.com/products/ip-pbx/snom-one/ for more details.
Please see the forum post http://forum.pbxnsip.com/index.php?showtopic=3969
Please refer to the snom Press Release