By all indications in the Google News, it appears that there is a strong demand for a Service Pack for Delphi 7.
Going by Borland Software Corporation's track record, it would appear that a service pack for Delphi 7 is imminent.
See Service Pack for Delphi 7
In 2017, with the release of Delphi 10.2 Tokyo, Embarcadero introduced a specialized implementation of the Observer pattern into the System.Classes unit. While it has been in the wild for 9 years, it remains a "hidden" architecture for many, primarily because it serves as the invisible engine behind LiveBindings. Other than live bindings, you can also use the Observer pattern as a way to update component settings to the Windows registry, an .ini file, or persist it elsewhere.
System.Classes