I don't know, but it is rather curious that it is strictly a NA discontinuance rather than a world wide issue. Similar to eliminating the spark trap and the metal cutting blades from the US arsenal. Far be it for me to be a conspiracy theory perpetuator...but there is something awry.
Festool corporate says its because of lagging MFS sales, yet when you realize that they've doubled down on the USA market by offering routers with (bogus) imperial scales/measurements to significantly increase their sales, you have to ask the question as to why they try to increase market penetration while at the same time they're eliminating some of their most functional accessories. A router and a router template go hand-in-hand, much the same way that a router and router bit go hand-in-hand.
Whoops...did I mention that Festool also discontinued most of their router bits in the US...