Still massively over priced at £370 I feel, especially with no AP discount. Although saying that, I've just had a look at the prices of some themed rooms for a Saturday night in August. Here are some prices based on 4 adults in a room:
Standard ATH room: £221.25
Standard Splash room: £206.25
Sonic room: £382.50
Moon Voyager room: £333.00
Peter Rabbit room: £328.50
Chocolate, Splish Splash and Celebration rooms: £427.50
Other themed rooms are of similar prices. On the Friday night the Moon Voyager room comes down to £306.
So it looks like the Moon Voyager rooms are going to cost less than most other themed rooms in the long run, which is probably how it should be. Although it seems they are definitely themed rooms at the moment, not better standard rooms. Have the themed rooms always been this expensive though? I'm sure they've not. And no discount on them is poor.
EDIT: Moon Voyager rooms are
£333.00 when booked online for 16th March.