Mart: I still don't think you've fully understood my article or the way the UPP works, or you still wouldn't be asking these questions.
The number of people on the Mozilla project is far far larger than has ever been on any commerical RISC OS browser project, which is precisley how it'll keep up with standards. Simon's comment is close - but the truth is perhaps even better than he suspected. Many of the programs in the UPP are automatically built. Many don't even need changes to work on RISC OS - the initial porting work is in fact improvements in Unixlib/CX11/Porting tools.
I would expect that new versions would be very little effort to build.
Andrew: Please go (re-)read my ChoX11 article. Apart from that, your comment too belies a misunderstanding of the porting process. A kaffe port builds upon a great deal of existing work, and the approach is very different to building an AWT from scratch.
Please also do not presume to speak on behalf of RISC OS users, because I am certain you do not.
I'm a bit surprised all these questions have come up now - they're ones I've answered several times before in various forms and in various forums.
Mart: As for the time frame - please either convince more developers to help with CX11/Unixlib improvements or persuade more people to subscribe to the project so I can spend more than the rather minimal time I do now on it.