yes because:
1) they could update the 13" MBP but since is a redesign as well, they like to update both of them at WWDC
2) Because the HD580 is not ready until May for market, the 15" is waiting for WWDC, and look point 1)
3) I think, and hope the mac mini will be updated too , even a little redesign to be more portable since skylake and thunderbolt 3 can allow apple to make them thinner and lighter
Since we will get this year a lot of thunderbolt 3 devices, i will not be amazed if they update the Thunderbolt display for 5k @60hz