*He will be excited, remember he told you he wasn't even happy about the last lady being pregnant yet he's still excited about his boy.
OP, remember too, kinda like robotroy suggests - it will be very different (as in, so much better!) for your DH, not just having a child, but having a child within a loving relationship and being able to really be a full part of that experience and just enjoying it.
My DH was very happy with the mother of his children, and even so, he has said (and I believe him) that he enjoyed the early days more with DD, simply because of where he was in his own life and that he felt more able to relax and enjoy new fatherhood this time around.
Now when we're in the middle of trying to conceive our own child, he's non stop talking about how he's going to go football and boxing with his son when he gets older (he's currently 2).
Reading that again, I think it's possible too that your DH might be afraid (irrationally, again, perhaps, and maybe not even consciously!) of what will happen with the child you are TTC. He has already missed out on a lot with his older child, and it would be understandable if having a child with you made him feel quite vulnerable - some part of him might need reassurance that he WILL be able to do all these things he is talking about, with your child. That might be why he is talking about going to ball games etc now - it seems insensitive to your feelings, but maybe in a way it is him asking for reassurance just like you need yourself - am I making any sense here?