Actually, instead of 0.98 you should really consider the gtk3 bazaar branch.
At this moment, it contains 2 known regressions compared to the gtk2 bazaar branch (which already has maybe two dozens of bugfixes since 0.98), and the underlying VTE library (responsible for the terminal emulation itself) has received 100+ bugfixes and improvements since the gtk2 days. Hopefully these 2 known regressions will be fixed in a couple of weeks and a tarball will be released too. See also https://bugs.launchpad.net/terminator/+bug/1030562
