Possibly you have heard about new refreshed casio calculators models.
Perhaps for economic/market-related, or simply to add small features (like projector connection in classpad 330+ and 32gb sdhc card support in new fx9860...), Casio has upgraded their line of calculators with more powerful hardware.
New/upgraded calculators: Casio fx9860 GII SD USB Power Graphic 2 
The new
casio Fx9860 with label
USB Power Graphic 2, now support sdhc cards up to 32gb and use an SH-4A CPU without FPU (SH-7305) like on the Prizm.
However, programs/games compatibility is compromised, with changes in
some sdk functions and
port addresses. According to the reports of some users maybe more than 70% of the add-in games/programs do not work in the new model.
If you want to buy a calculator of this serie, you must consider buying the old versions to be able to enjoy the games and applications developed by diverse communities. The community will need some time to start releasing/update software for this model.
This model is easily identified, as I said earlier, by the label USB Power Graphic 2 under the screen and in box, or by the preinstalled firmware version "OS 2.02".
On the left of the image is the new model USB Power Graphic 2, on the right is the old model.
(credits image: planet-casio) Casio Classpad 330 Plus 
I have written some time ago, a post about major changes in this new model, can be found
here.
To summarize here the news:
-Cpu refreshed (sh4)
-Casio created a system to increase the accuracy of rechargeable batteries in os indicator (like prizm)
-Is possible use this Classpad with Casio Compatible Projectors like Prizm!
-The calculator is a usb disk when connected to pc, like prizm. You no longer need to use software like FA-CP1 to put file on calc. Maybe the restriction on the transmission of unknown extension files to the calculator is removed (unconfirmed yet).
-The compatibility with old games/programs was broken. This classpad use add-ins with new extension (.c1a), and there is no sample add-in or sdk yet.
-Old eActivity format (.fls) and program basic format (.mcs) used during classpad OS 1/2 are not supported in this model. You need convert .fls->.xcp (eActivity) and .mcs->.vcp (programs) with classpad manager.
Casio fx-9750GII and fx-7400GII 
(credits image: nexusss)
This 2 models also received a new cpu according to
cfxm. They have no label, the new models are detectable by the OS version 2.02, only (or by inspecting the board), according to
SimonLothar.
I think it is still possible to mod fx-9750GII into fx9860 gii sd power graphic 2, you only need a fx9860 os 2.02 image (unconfirmed yet). If it really is possible, problems of compatibility with add-ins in fx9860 power graphic 2 persist in this calcs.
Casio Prizm fx-cg10 SC Blue 
Casio released a casio fx-cg10 model with a blue case in usa. The
hardware is the same, is only a aesthetic change.
Summarizing: If you are a gamer/student and want to buy a new of these calculators, you must find the old version. The new changes alone are not attractive, until developers turn to these new models.
If you're a casio developer, you should look for
this post and adapt your add-ins for new models. There is also some information in
fx_calculators_SuperH_based documentation by SimonLothar.
Sources and other discussions: Casio Usb Power Graphic 2 SDK Info - Casiopeia Classpad 330 Plus Changes - Casiopeia Refreshed Calcs - Omnimaga fx9860 broken compatibility - omnimaga news Nouveaux-modeles-incompatibles - Planet Casio (French)
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