AutoLISP from 1987 on had no language improvements so far whilst lisp developed rapidly and CL even became the first ANSI drafted standard language. The new xlisp 3.0, which is more scheme like, has a very good documentation. Oops this was a SoftEngine Bug. Computers became faster now, speed is not critical anymore. Each element of a lambda list is either a parameter specifier or a lambda list keyword .
Implementations are free to provide additional lambda list keywords .
More attention to beginners in the way commands are handled. Graphical UI is great but the commands are still ancient style. You cannot handle large projects with XREF's that way. This way your are sure to see all neighbors when opening a single subproject. The fact that everybody uses NT doesn't mean, that everybody likes it.