See the LispWorks Foreign Language Interface User Guide and Reference Manual for details of these changes.
FLI vector types have been added, with names such as fli:vector-char2. These correspond to the C/Objective-C vector types that are defined by Clang, which is used on Mac OS X, iOS and FreeBSD and is optionally available on other operating systems.
The :calling-convention keyword argument for fli:define-foreign-function and fli:define-foreign-funcallable can now have value :fastcall, to support the __fastcall qualifier in the Visual C and GNU C compilers.
fli:define-foreign-function and fli:define-foreign-funcallable have a new keyword argument, :variadic-num-of-fixed, which needs to be used when calling variadic foreign functions.
The foreign block API (see "Block objects in C (foreign blocks)" in the LispWorks Foreign Language Interface User Guide and Reference Manual ) is now supported on iOS.
The :aligned option now works in fli:define-c-struct. This was documented in LispWorks 7.0 but not implemented.
LispWorks Release Notes and Installation Guide - 19 Oct 2017