Nothing has changed or been decided yet. The Commission issued an NPRM (Notice of Proposed Rule Making), to allow AM stations to go full-digital if they choose. I believe the comment period for the NPRM ended recently. Even if the Commission finds in favor of the plan, there are several technical parameters that need to be determined should a station be allowed to run only digital mode, before such a rule change can be made. Things like: determination/measurement of output power, differences in the RF mask, night propagation for full digital (RMS vs. peak) given existing analog protection limits, etc. Just this handful alone, could take a while to re-write.
The link you sent is just Radio World and certain equipment vendors starting the conversation, probably to gauge the interest and whether money will be associated with the interest.
