Same set of rules but each faction/army getting a new book with points, equipment, and stats being revised. Might not be huge changes but these are the new standard. Its not that the £100 or so on previous material is now useless, its more the £60+ I'd need to spend to update all my models.
Might just give buying these from GW a miss and hold out for kids selling them on eBay in a few months. Fat chance of that but its a possibility...
To be honest its a shame the game is not more popular. I guess GW was always gonna push for WotRing over the strategy set on a purly sales basis. To few people i know that play and as i have enough models to play most scenarios I'll be giving any new purchases a wide berth.
Now if a hobbit set comes out this Christmas, this may all change