I know! Don't tempt me!
I saw some impressions of the new 3rd gen UE18+ and apparently they have a slightly different sound, brighter if I understand correctly. Of course there is the LIVE, which should be pretty much perfect for training...
Oh, don't worry... all of the older models will adopt the new connector as well, so there's really nothing stopping you from getting the 2nd Gen UE18+ other than yourself...