Congrats on YOUR pregnancy...I capitalized
yourbecause even though you aren't physically carrying the child, you will go through some of the same emotions/concerns as your wife.
We had two boys.
Get ready for some sleepness nights with the birth - but enjoy them. They do grow so fast...my oldest is about 3 months from being a teenager, and my youngest is growing into his own personality.
If you can or are able to - make sure you cut the cord. That, to me, is a great feeling in itself.
Raise the child right - make sure you put Celtics stuff in his crib and in his room

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Congrats again and hope all goes well with you and the new addition!