Sunfire TG II vs TG III: Differences ???

Does anyone know what the differences are between the Theater Grand II and the Theater Grand III ? I can't find any info about this product and Sunfire's own website still has the TG II listed as their current Pre-Pro. I was also curious as to whether or not anybody has heard whether Sunfire will be offering the "upgrade" program like they did when they went from the TG I to TG II ??? Sean
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