There has been some developments with Aerojet and their Hall Effect thruster which demonstrates the continuing trend to put ion propulsion on more satellites and to base key mission functions on this technology.
What has happened is that the 4.5 kW Hall Effect thruster (a type of grid-less ion thruster) has been switched on successfully on the Advanced Extremely High Frequency (AEHF) Space Vehicle #1 (SV#1).
The Hall Effect thruster is being used to orbit raise the satellite in conjunction with the more conventional hydrazine chemical thruster system on-board.
What is also interesting is that this thruster has a High Thrust or a High Specific Impulse mode, which typically means more power in one more and less propellant for the same thrust in the other. And this mode switched has been demonstrated to some effect.
It is good to see ion propulsion being employed to further flight heritage with the technology!