New Modules
 

Is there anything new in the pipe, as far as modules are concerned, for the Apex? Like maybe a calcium or nitrate module?

Neptune keeps pretty tight-lipped about any new products.

Probes for the items you mention are not intended for 24 hour wet use; they are more for casual testing only so I wouldn't expect to see modules for those specifically.

New products tend not to be announced until they are ready for release.