I think they have a beautiful and strong bond. They obviously care about each other immensely. Mycroft's worry is touching and Sherlock's childish behaviour, and obvious irritation, shows that he cares enough about his brother for him to effect him in such a huge way. I love them both and the writer's are amazing for creating such a complex relationship between them which makes us want more.

I don't want a full reconciliation between them just yet because the dynamics between them work so well as it is but I yearn to see a moment where the connection is blatantly obvious then they go back to the way they were because they are uncomfortable crossing the bridge of reconciliation.

I have this headcanon where Mycroft is in on the plan up to a point but then Sherlock has to improvise and cannot tell Mycroft as they have to keep up appearances of their estrangement. This means Mycroft doesn't know about the plan to jump off the roof and he genuinely believes Sherlock has died. He rushes to the morgue and Molly takes him to Sherlock. When he sees him he almost breaks down and hugs him before returning to his usual cool, calm and collected self.

If this was to become canon I would burst from the feels x

I also think the Holmes brothers already have a very strong bond. (Just think of the morgue scene in "A Scandal". Mycroft Holmes lecturing his little brother on the advantages of not caring, and the moment Sherlock is out of the building he is on the phone with 221b to make sure Sherlock won't be alone when he gets there.)
 They would be loath to admit how much they care though, and this is part of the beauty of their relationship, so I am not sure I would even want it to change that much.
But I would be very happy to learn a bit more about the Holmes brothers' background in series 3, and I think we will be getting just that.