I haven't read any spoilers or anything for future Batman issues and am making this pick based on the evidence that Morrison has presented us thus far. My pick for the black glove is Alfred hands down. I seriously suspected Tim Drake for all the obvious clues such as the red and black theme that matches his costume plus the fact he had some really ominous dialog but several things occurred to me to make me choose Alfred. The Black Glove has to have unlimited access to all of Bruce's working and have been watching him for a while. The man with the most access to Bruce is Alfred. Through everything that has ever happened, Alfred has always been there and Bruce has always confided in him thus leading to him having the greatest amount of information on Bruce. Another thing that eliminates a majority of suspects is the age factor, we are lead to believe that the Black Glove has been operating for a majority of time so that would eliminate Tim Drake, Dick Grayson, and anyone else younger than Bruce. There are little pieces of dialog that compel me towards this conclusion as well. There was a scene during the "Space Medicine" issue where Bruce was reflecting and he mentioned the fact that Alfred always compelled him to write everything down. Alfred is aware of everything Bruce does to prepare for whatever and he could stay one step ahead of him since he knows what Bruce has and hadn't prepared for. Alfred was also somewhat responsible for introducing Bruce to Jezebel indirectly. Alfred also fits the several of the descriptions that Grant Morrison has stated:
"Ultimate diabolical b_st_rd who decides to destroy Batman"
"What's the biggest most twisted bad guy we could use"
"When we begin to suspect the identity of the villain, I think it's [...] possibly the most shocking Batman revelation in 70 years."
"And then above that you have the identity of the Black Glove, who is a person."
"the ultimate diabolical mastermind story about a villain who has been plotting Batman's destruction for so long and with such precision that no-one even suspects his existence - except Batman"
"It's the biggest, most twisted bad guy we could use against Batman"
"it's so up front and obvious. Every issue tells you who you're dealing with it, and it's a character that everyone on the planet knows."
"I keep thinking it’s so upfront, so obvious, that readers will inevitably demand an impromptu hanging when the reveal is revealed"
"to me the answer is so obvious that hiding it has been the real challenge"
Alfred is a character that everyone on the planet knows and he has been upfront and obvious. Mention the fact that he seemed to disregard Bruce mentally breaking down when Tim started asking about him about Batman going crazy. Alfred is my pick for Black Glove and tomorrow we get the conclusion for the R.I.P. storyline.