Talked to the Relaxo guys yesterday and asked about the new MP. Their response was: "Yes, we improved the mouthpiece and now the screen can be changed and easy to clean."
Looks like we'll get an improvement here!
@TNT_error - Since you're already talking to them, can you ask when they expect the updated version to go on sale?
@HSIHP - Did you ever try the cotton in this to help the filter problem? How'd it go?