According to Adam Mersky at Turbine, via MMOrpg.com, Volume 3 is on target for a February release. I think most other posts had the info that Volume 3 would be the first content release after Mirkwood and “Early” in 2010 but this was the first “date” I’ve seen. Other updates throughout the year are promised but no actual information – which isn’t surprising.
Seems about right, 2-ish months after Mirkwood – but that probably means there’s not too much in Volume 3. So most likely, no Rohan, no mounted combat, but probably some land-mass. Possibly Fangorn or Isengard as I’d expect the rest of Mirkwood to be more closely tied with a Hobbit movie release. Isengard might make sense as we’re pretty much at the end of the Fellowship book (or pretty darn close) and that area is starting to cause more issue with the rest of Middle-Earth.
Anyway, we shall all see soon – at least what’s in Volume 3 😉