Chris - the drug is vedolizumab and the FDA's advisory committee on GI drugs is discussing it on Monday. They'll be posting a whole bunch of documents about it here: http://www.fda.gov/AdvisoryCom...mittee/ucm371061.htm
Not sure if you like reading about all this stuff or prefer to leave it to the pros, but I thought I'd post... From what I've heard, vedolizumab is supposed to be a good option for people who have lost response to Remicade. Not sure if you have ~2 months to wait but if you can I definitely would. I agree with you that Tysabri is not worth the risk if you're positive for JCV.