– edit –
I must have written my answer without refreshing the page, as I didn’t see Amal’s response before mine . I don’t think I contradicted anything he said, but is so, please disregard my response.
The exact sub-module specs for the Smart MX2 Chip in the VivoKey are not public, but the https://www.nxp.com/docs/en/data-sheet/P60D145_SDS.pdf data sheet should be very close.
This depends on what you mean by “standard”. But, based on the specs, the VivoKey Flex One should be able to emulate either a Mifare Classic or Mifare DESFire EV1 chip. The Fidesmo platform also seems to support endpoint configuration for interacting with the chip as if it were a MiFare Classic. It looks like you could write an applet to emulate one of these chips, then deploy/select it using Fidesmo’s platform.
I don’t know of any cards with the exact same chip, but Fidesmo sells reference cards with a similar SmartMX chip. Anything that runs on their reference card should work with VK, but the reverse may not be true. You can order their card from http://shop.fidesmo.com/product/fidesmo-card (and sign up for a developer account).
The VK One will come pre-configured to work with Fidesmo’s ecosystem. It seems that users will be able “uninstall” the Fidesmo integration with a one-way, irreversible process. This would allow you to write and deploy JavaCard applets directly to the VK, but you would lose the ability to distribute apps, and would likely be limited to a single JavaCard applet unless you wanted to design your own segmentation framework.