This is the current upstream release. On their homepage, there's also a vtk-8.1.0rc1 release available.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=f65d47fe4d9f73cbe3b88f9af08fa1fad859fb93 commit f65d47fe4d9f73cbe3b88f9af08fa1fad859fb93 Author: Jonathan Scruggs <j.scruggs@gmail.com> AuthorDate: 2018-01-22 20:50:35 +0000 Commit: David Seifert <soap@gentoo.org> CommitDate: 2018-01-24 19:52:54 +0000 sci-libs/vtk: version bump to 8.1.0 Closes: https://bugs.gentoo.org/638024 sci-libs/vtk/Manifest | 4 + sci-libs/vtk/vtk-8.1.0.ebuild | 339 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 343 insertions(+)