The new version has an improved user interface and the ability to include multiple photos per entry (up to 10). One of the most interesting new features is the ability to run multiple journals. You could, for instance, have a journal about one of your children and another about your own personal naval-gazing. Those productivity minded folks could even have journals related to specific projects at the office.
This is in addition to all the great features that Day One has developed over the years including tagging, export, and its remaining bag of tricks.
I've loved this app for a long time but been really iconsistent about any sort of journaling. The UI is much more modern feeling without losing that uniqueness that endeared Day One to us all before. These were instant buys for me.
See the extensive MacStories review