Version 0.15 of iwyu (include what you use) has been released 2020-11-21: https://include-what-you-use.org/
Is it different from include-what-you-use-11.0 ebuild? It uses 0.15 internally: https://gitweb.gentoo.org/repo/gentoo.git/commit/dev-util/include-what-you-use?id=fdcfeb14a0acad5d73da3da738db07cf217f7068
No it is not. I just got confused that the Gentoo ebuilds don't follow upstream's versioning. Sorry for the nose.