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The upcoming dingoo-related devices are the gemei a330, the dingoo a320e (by DingooDigital), the dingoo a320e (by DingooTechnologie) and the Dingoo a330 (by Dingoo Digital) in that release date-order.
the DD's dingoo a320e
will just be a rebranded gemei a330
.DT's dingoo a320e
is ether a rebranded or faked/cloned a320e or a completly different
device with stolen name.
The Dingoo a330 by DD
is going to be much stronger
than all these versions (supposedly using the CC1900 (ARM11 1.2GHz) or the upcoming CC2000), but the release date is unknown (I'd assume more than a year away
by now).Links: Gemei a330.....Dingoo a320e(DT).....Dingoo a320e(DD) and Dingoo a330(DD): HERE and HERE
I mean an updated version of the dingoo 320
with a better processor, maybe a super amoled screen
To answer your questions: I'm quite sure none of them will have an OLED-screen.
They will all have new/enhanced processors (over the dingoo a320).
The Gemei a330 has a extra sound-chip - the same apple uses, so it will have a better sound quality. But hardware-wise it will most likely have the same speakers.