http://winetricks.org/download/releases/ there is winetricks-20141130.tar.gz . copy winetricks-20140302.ebuild to winetricks-20141130.ebuild which installs WINETRICKS_VERSION=20141125
I too can confirm that renaming the ebuild is sufficient for this version bump
*** Bug 540524 has been marked as a duplicate of this bug. ***
Fixed, sorry for the wait! +*winetricks-20141130 (07 Mar 2015) + + 07 Mar 2015; Alexandre Rostovtsev <tetromino@gentoo.org> + -winetricks-20130707.ebuild, +winetricks-20141130.ebuild, + winetricks-99999999.ebuild: + Version bump (bug #532226, thanks to jospezial), adds controlspy, qdvd, + setupapi, updspapi, vcrun2012. Change live ebuild from svn to git (bug + #540662, thanks to Bob Wya and NP-Hardass). Drop old.