Tapestry 5.0.12 will be available pretty soon; I'm working on one very important component that's tricky to get Just Right: AjaxFormLoop. This is a component that allows you to dynamically add and remove rows (or divs, list items, whatever) that represent detail objects under a master object ... think line items in an invoice. The trick, of course, it to make it useful as-is, and to make it easy to customize it. It takes a bit of state-management gymnastics to make everything work just right, but it's almost there.
I expect to get this finished up in the next couple of days along with other work, and create a 5.0.12 release early next week.