I highly doubt it would be a new class simply because a new class would require quest creation, editing quest dialogs, and editing NPCs in every region / instance to allow for a new class. Simply not going to happen in my opinion.
Turbine alludes to trait trees opening up opportunities for this surprise. In my mind, that means it definitely deals with classes. Look for turbine to add something like class swapping on your character via the trait tree system where a player could be both a hunter and a minstrel on the same character. Swapping classes outside of combat to an already saved trait tree for a different class. This would benefit the game in many ways:
1. it would allow LotRO to modernize to what newer MMOs allow. (FFXIV allows a single character to play all classes and crafting professions).
2. It would allow smaller server communities to fill groups more easily.
3. Turbine could charge per class change slot on the trait tree system for premium members and give VIP'ers maybe 3 slots, thereby paying off the development cycle for this new class system.
4. double dip on players who already have 15 character slots who might want their mains to have double duty.
You guys always get your hopes up for something big like a new class. Set your expectations lower than you usually would and find a way to tie in-game currency, and you'd likely come out with something more realistic.
LvL 100s: Beorning, Burglar, Captain, Champ, Guardian, Hunter, Lore-Master, Minstrel, Rune-Keeper
LvL 85: Warden, Minstrel
All my forum posts are my opinions and may not even be that. Also On Twitter: @leixicon