From GameWacher: “Iceborne is going to essentially double the content available in Monster Hunter World, but if you thought that was all you were getting with its release, you were wrong, as this DLC will get a number of additional free DLCs released after it’s out.
According to Kaname Fujioka, the Producer of the game, Monster Hunter World won’t get any more free content updates, but the Iceborne DLC, however, is going to be supported for a while yet.”
Source: N4G PC Monster Hunter World: Iceborne will get additional free DLCs