I know that "will come" is simple future and "will be coming" is future continuous. Native speakers might actually prefer I'm coming tomorrow. Both statements with the progressive simply refer to the activity as having duration. But we'll also say I'll come tomorrow and I come tomorrow. These are all valid expressions. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.