Assuming that pros you mean MacBook Pros and not Mac Pros – pretty confident actually.how confident are we that new pros will be announced at WWDC this year?
The MBPs had a very regular update cycle in the past that (bigger redesigns like the 2016 one aside) never took longer than one year, and the last MBP being released in June 2017, so June 2018 would fall perfectly in that cycle. Also, Intel's 8th gen chips with the respective TDPs for the MBP are announced and being rolled out this and last month already in many other laptops, and that the performance leap this year is much larger than usual which would put Apple way more behind the curve if they wouldn't update the MBPs anytime soon than in any of the previous years. Furthermore MacBook Pros are one of the, if not the most popular and well-sold machines in the current Mac lineup, so there's no incentive for Apple to "drop the ball" on them or just neglect them.
I'd consider all of these strong indications that new MBPs are soon to be rolled out; in fact I'd be very surprised if WWDC 2018 passes without a MBP refresh.