The current plan for the extension which will be finished in 2012 / 2013 will go east from a new Epping station to South Morang with no stops in between. They are also upgrading the Thomastown and Lalor stations.
I have seen some comment that at a later stage and not confirmed, that an offshoot would go from Lalor station past the hospital and into the new estates Epping north and further. However, I find this hard to believe as it seems an awkward solution. I guess vocal public demand is the best bet. Perhaps the new Liberal government would be willing to try to win over some traditionally labour voting areas...