Yep, Ant 1.6.2 has been released. And the forkmode option for JUnit is there!. I'm really happy.
Updated: Time figures for the fork mode option:
forkMode="perTest": 3 minutes 31 seconds for a standard (non-clean) build
formMode="perBatch": 1 minute 16 seconds.
So about half the old build (which did do more than just run the unit tests) was taken launching the test JVMs. Absolutely amazing.
Oh, and then there's the test failures because of bad tests that changed static values and didn't reset them; must remember to talk to the team about that...