Some are some are still only tested to 9ks rear-facing. The new 0-8 Luxi won't rear-face as long as the SafenSound Meridian. I think the new Neon(Infa Secure but don't quote on that I'd have to check) has the highest rear-facing markers. Some people have their 2 year olds still RF in that one with room to go.

Addit: The Neon is an Infa Secure seat only available at BigW I think. The 0-8 Luxi (also Infa)is targeted as "The only seat you'll ever need" That's only if you want to forward-face early though.
Now I know why I am importing! Pretty sure the 'recommendation' is rear facing to 12mths but only legally required to 6mths/8kgs. You would think the manufacturers would run with that but considering they arent even organised with the Isofix changes yet and its legal in 2 months.........................