Actually, as far as I know, Poser has come out with a new figure for every release since Poser 4. Well, new or reworked.

Poser 4 was Posette the P4 woman

Poser 5 was Judy and Don

Poser 6 was Jessie and James

Poser 7 was Sydney and Simon

Poser 8 was Alyson and Ryan

Poser 9 was Alyson 2 and Ryan 2

and Poser 10 is Rex and Roxie.