Are there any current high end dipole speakers (dynamic)?

Audiokinesis is correct.
Berner, A dipole is special because it radiates in a figure 8 pattern. It radiates very little to the sides. A bipole is omnidirectional radiating in a circular pattern. The dipole limits early reflections in the room. If the dipole is a line source the only reflections will be to the front (early) and rear (late) walls. No the side walls, the ceiling or the floor. The early reflection off the front wall is easy to control above 250 Hz. Below 100 Hz were things get critical the best way to deal is with subwoofers right up against the wall and in corners. That way the primary sound wave an first reflection are identical. All this makes room treatment easy. The resultant system will have relatively smooth bass response throughout the room and superior imaging. I am not prone to superlatives but the imaging is vastly superior in all dimensions. Getting a bipole to perform like this is difficult, maybe even impossible. It would require the right room, extensive room treatment and clever set up. Since I am dumb I'll go with the dipole every time:) 

Mike

Another vote for Spatial.

     I have owned B&W for over 40 year, since selling my, Quad receiver, then Phase Linear powered stacked Advent grad school party system. During this meantime, I had electrostatics for 25 years, and Maggies for a few years. We also had Quads powered by Bedini. which were truly great when used from 4 feet away. In our home, we auditioned Time Windows and Dahlquist, along with Time windows.  If you want to blur the sound all over the walls, I have a near-perfect set of Bose 701's Serie II someone gave me. They have not been hooked up in my house, but they were very interesting on acoustic piano, when powered by his Bryston Electronics, which he also gave me.  
     The Bryston stuff is very good, nearly equal to my Audire equipment. I am still amazed he used it with Bose, but it worked for him. 

Listened to the M1s when they were new and was very impressed. I would have gone for Apogees at the time (just missed a pair of Scintillas which are a bear to drive but sounded very good).

The M3si is a very special speaker and your going to have a hard time finding a suitable replacement I'm sorry to say.  I wish I had a suggestion, but I'm on the hunt myself.  Another issue is cost, your going to have to spend some serious money to find something in 2020 that's full range and has the same HUGE soundstage.  Personally, I'd keep them or if your on the East Coast, sell them to me. :)