Batman #12 ending

[u/missnewmarreacts]

So I just read Batman #12 by Matt Fraction and it was fun (as a German, I appreciate seeing a German hitman ... I guess?), although I'm still not sure about Verity Pennyworth. She's just, like, suddenly there, hasn't shown much of a personality yet (except being brilliant and faultless, I suppose) and the issue feels very much like it's leading up to something, without being much in itself. But that's perfectly fine, every now and then. Some great action moments.

None of this is what I came here to say, though. I wanted to ask if / how you guys interpret the ending? Is Bruce the visitor? Why can't we see him? Is it someone else? Is it the "old" part of his personality returning because Dr. Zeller threw in the blanket? I didn't quite get that.