To dream of heaven does not mean that anyone is going to pass away in real life... unless you have a history of dreams come true. This is a dramatic way for your subconscious to communicate with you.
In reality heaven is a place that is mankind's reward for being upstanding citizens of the world, making good choices, and giving selflessly to others in need. In your dream it represents the harmony of heart mind and spirit.
Who is in or going to heaven and what part of yourself does he or she represent? Or in reality, is this person in their own kind of harmony you admire from afar? Do you wish you could be like that?
If you yourself is going or are in heaven, you are in tuned with your subconscious. The vision of heaven is your reward.
Heaven is also a place to go after death. Death in dreams means change. So this could be sign that your subconscious can't wait for a foreseeable change to occur.
