Yes, it has been officially confirmed that the base game will keep receiving patches and updates:
I don’t work for or with Funcom, so this is not something I can answer with 100% certainty, but I really, really doubt they will add new areas to the old map. The reason for that is that they repeatedly stated that the version of the Unreal Engine they use cannot handle such an addition.
That’s an excellent question! It would be cool to ride the battle rhinos on the old map!