anyway to tell what the file size of dragonborn will be? thanks in advance.

Not until either its released or if a mod/dev tells us

No, they usually don't tell us the size of the DLC. In fact I have not ever seen the size of the DLC until I go to download it. It might be stated somewhere else, but I have not seen it.

In the past DLCs for these games have ranged in size from a few MB's to a couple of GB's, but they have been getting larger later games.

I was wondering cause i have a 4gb xbox, but i remember them knowing what it was on dawguard b4 we got it but i guess thats cause they had the beta thing going on.. thanks anyways my friends!