As far as I know you can’t do 529-Roth. For us – future contributions are going to Roth. The salary limitations have gone up and my husband retired so we’re *well* under the limit. (That’s good and bad… I guess.)
The nice thing about Roth is you can withdraw penalty free for qualified education expenses… just like a 529… but it’s not limited to education like a 529 since you can also use it for anything you want once you reach 59.5. So any unused education $ can be used for retirement.