It is hard to tell in the picture, but it is a little farther up on the leaf and looks much different than a new pseudobulb emerging. It almost looks like a new root, but it seems such a weird place for a root to grow from.
Does look to me a lot like B. cucullata, could also be B. perrinii, a few other possibilities have similar growth habit and terete leaves. All have similar culture - they do prefer a bit of warmth, but it sounds like you have that handled. Looking forward to the blooms!
I don't see a spike in your photo, but I think that you have a nice new root, always a good sign!