Wolfbrigade has cancelled almost all of their US tour plans. Here's the complete statement from the band:

We are truly sorry to anounce that we will not be able to fullfil the US tour. Micke, our singer, have got an infection on his vocalcordes, and this jeopardies not only our last recording we are doing this weekend, the whole US tour, but also Micke's abilty to talk and sing in the future. He will go trough a operation sometime soon, and hopefully he will get better.
His doctor says he might be able to do one or two shows, so we will do thrashfest(even though it will be painful for him), but not 14. We are really sorry for this, we have been looking forward to end the band in a proper way, and now everything is in danger.
We have been discussing talking in an stand-in singer, but it doesn't feel right when it's our last shows. It just isn't an alternative in this situation. If Micke had left the band maybe, but now, hwn he can't do it due to an infection, it doesn't feel right.
Our apologies to Felix, Yannick, Michele, and everyone else involved in this tour. We will report news on Micke's voice when we know more.
Keep your fingers crossed and we hope you understand that this is nothing we've choosed.

Those two dates still happening are May 1 (Thrash Fest 5) in Minneapolis and possibly May 3 in Chicago.