from what I can tell we are up-to-date.
The release schedule is because, from what I remember hearing/reading somewhere, Azuma doesn't have a schedule for the series. He just sorta works on it whenever and delivers finished chapters whenever he's satisfied with them. He's under no obligation from the publisher to deliver X chapters a year or finish one every month or two.
The series is like 22 years old at this point, so when you consider that we're at 114 chapters that means that we've averaged maybe 5 chapters a year.