I haven't been yet but if you look at the history of patterns the last few years (readily available on bowl.com)
Teams the last 3-4 years has been 38 feet
Doubles/Singles ranges from 39-42 feet over the same time period.
I'd venture to say for this year teams will be the same length as well as the minor events. When they make the change to only 4 people on a pair for the minor events, I'm sure you'll see that pattern closer to 39 feet rather than 42 from last year.