You read the blog post The Future of PowerPC and Carbon Support?
Here at Monkeybread Software, we always support old stuff a few longer than Real software. That has been true for 68k, Carbon and Classic PEF support. With Lion, Apple may drop a few more things like Mac OS X 10.4 support. At some point they will drop compiling for PPC on current OS versions. I'm not even sure if Xcode for Lion will contain PPC support. We'll have to see.
So we commit to provide Carbon and PPC support for some time, but it could be removed someday due we replace our development machines or need to upgrade operation system. But I don't expect this to happen this year. Not sure about next year.