PPC-stuff ?
You mean WOS

?
Wouldn't work for stuff like Voyager (unless you plan to rewrite it from scratch).
And OS4 just ain't there (yet).
Bout Titan, yes I have seen several interviews where they stated that they would
support OS4 when it's ready,but they also have been not so optimistic about it
like some people wanted them to be (and have been prooven right in the last 2 years).
While I don't know the connection between Alex Knabe (who did the presentation
in Rotterdam) and Titan,but one of the 1st things he stated was that a
OS4-version of BurnIt is quite likely to happen.
About starting this "war":
Sofar I have seen only one company ruling out one of the 2 OSes, and that since
2000 ........ :-o