The Stylus is being replaced by the new SD-10G radio system, CGRetired:

http://www.rcuniverse.com/forum/m_8208862/tm.htm

You can't buy a new Stylus, but Airtronics is expected to release a 2.4Ghz upgrade module for the Stylus at the same time they start shipping the new SD-10G radio system and the additional 2.4Ghz receivers. Mike Greenshield's best guess as of late is early April; he said he expects these products to be ready to ship around the time of the Toledo Weak Signals show.