I'm not familiar with Samsung's model numbering scheme but they surely follow the same kind of convention as all the others.
Short of calling and asking for clarification, one way to tell which are the newer models vs last year or soon to be discontinued models is to look at the features.
For example, most new 2007 models will have 1080p native resolution, accept 1080p inputs, and use 120 Hz refresh rate. The prior model might have 1080p native resolution, accept 1080p input, and use 60 Hz refresh rate. The model prior to that would have 1080p native resolution, NOT accept 1080p input, and use 60 Hz refresh rate. See how each successive model adds one more thing that was not present in the prior model?