Hi J,
There has been no change in the ESA Regulations regarding this issue.
Gordon has written a post summarising information regarding this scenario in :
The Spotlight Area. As advised, you can challenge them to ascertain exactly "what" the interview is pertaining to, and whether it is Mandatory or Voluntary.
You can then make an informed decision on whether to attend.
Further information can be seen in :
This Topic and from the links included therein to other associated topics.
You will see more detail with respect to DWP Decision Makers Guidance and ESA Regulations on not having to take part in WRA/WFI if in The SG, and " Reasonable Adjustments" for disabled people as covered under The Equality Act 2010. (EA2010)
bro58