This one can't come as a surprise. It's Avacyn, Angel of Hope.
And this, of course, is Avacyn's old Helvault-mate Griselbrand. Everything's in order so far. Perfectly logical.
This appears to be an angel of some sort. That's not all that surprising in this set, right?
Whoa! This doesn't look familiar at all!
This, again, is an angel. And if you want to know more about it, check out today's Planeswalker's Guide to Avacyn Restored.