I recently was sent an email asking me this question and I wrote a fairly detailed response. Here was the exchange, for those of you who are shopping and are wondering if now is the right time to go "Retina" if purchasing a China tab. Hope this is helpful!
"Do you see a Retina tab fitting into your plans for the US Market? The Momo (referencing the Ployer Momo 12) looks promising, but I worry that the standard will be Retina soon."