Looks like a new Magnepan speaker is coming!!!

Yup ;-). My T-IVa have the two bass panels hinged together, with the tweeter/midrange panel separate. The current MG20.7 is around the same price as the Sanders ESL, and that is a tough choice, they're both great speakers imo.

 i would just want to buy the Bass panels.  

for when Sound Lab speakers look too small in your room...

- I'm glad they are making them tho 

i would just want to buy the Bass panels.

That would be a excellent way to add more bass to existing Maggie setups. If they could be used with other speakers, I wonder if Magnepan will offer them separately?

Also, they haven't said or showed how the panels hookup.  Maybe an external crossover, or someway the mid/tweet panels wire into the bass panels.  Will be interesting to see how they have done it.

I love Maggies.....except they don't last long.  They self-delaminate after a few years....(5 or so)   Maybe the brand new ones are using a different Dupont(?) product...I would hope.