IPNS records still have a default 24hr lifetime, but republishing your IPNS records is now much MUCH faster, so it should be much cheaper to run a process to republish these regularly. I assume you can also bump up your lifetime to >24hr if you want - but note that will mean nodes not using pubsub (aka getting updates pushed to them proactively) might be slow to get new updates.
Here's what's new for IPNS in the release: https://github.com/ipfs/go-ipfs/blob/master/CHANGELOG.md#ipn...