I know we're a bit late on the news of this, but for some reason, this one passed us by, originally being released in July. (thanks John P.Shea)
The Korg PS range are some of the rarest of instruments, the classic P3100 is one of those holy grail synths, not only is it extremely rare (600 or so made), but also features 48-note polyphony (yeah really, in a 1977 synth!) together with Low pass filter, three resonators and some semi modular patching options.
Full Bucket, bless 'em have recreated the PS3100 as the FB-3100 in VST/AU form available from their website. And whats more its free - yes, free.
If you want to find out more about the PS-3100 check this excellent article over at GreatSynthesizers.com