Somebody told me that it is now available with a 4-stroke engine.
The Yamaha RX100 has been discontinued because it failed to keep up with the emission norms. Because of the fan following of the bike, there are many enthusiasts who have restored old bikes or modified them. The news about these bikes may be the cause of the spread of rumors about the return of the bike. You can read all about the RX100 modifications and restorations here.