I'm guessing half-elves and half-orcs will be covered in 2009. The Race/Class book seems to suggest that barbarians and druids will be covered then, and the former - at least - is often associated with orcs/half-orcs.
Also, Eberron is covered in that year, and both half races - as I recall - have dragon marks specific to them. So unless those dragonmarks are suddenly moving to the tieflings and dragonborn in 4e, I cannot see those (half) races not being covered.
On the other hand, I can see half-orcs becoming the new orcs, and with the elves now divided into two, I can perhaps see the half-elf dragonmarks moving to elves while the elf dragonmarks are given to the eladrin.
That will actually be quite interesting. We now have at least two more races (dragonborn, tiefling) and arguably yet another elven race (eladrin). None of these have dragonmarks. We also are missing three races (gnomes, half-elves, half-orcs) that have dragonmarks. It will be interesting to see whether the number of dragonmark houses jump up to 15/16, or if the marks are suddenly assigned to new races. Or perhaps they will state that dragonborn, being part dragon, never have dragonmarks but instead something else, and tieflings, being aberrant part fiend / part human hybrids only have aberrant marks?
