I'm trying to figure out exactly what "С наступающим" means.
The closest my dictionary gets is:
наступать [pfv. наступить]
1. (with на + acc) to step on, tread on.
2. to attack; to go on the offensive
3. (with на + acc) to harrass
4. (of natural phenomena) to advance
5. (of time, a season, etc.) to come.
Number 5 looks most appropriate, and implies that "С наступающим!" would be a toast or salutation "To the Future!"
Or is it more specific, like "To the seasons to come!"? Or "To the year to come!"? Or is it related to the other definitions, as in "To the harrassment of our enemies!"?