The H1 might do some things better than the XBA3, such as bass and mids, but the XBA3 might have an advantage in sound stage and treble (only guesses based on their driver setups) Either way H1 should be on par or better than the XBA3. The H1 will definitely be better than the XBA2 in every way.
I have a mighty good feeling bout the H3, From the impressions we have seen so far it is sounding like a killer earphone, It looks to have excellent bass quality and extension, but maybe just a bit more in quantity than the EX1000, which I welcome
The mids may be very slightly recessed, but I have no doubt the quality will be insanely lush thanks to the dynamic and BA overlap. The treble is sounding to be on the right path with nice extension and no recession, I just hope they have completely revised the Treble BA from the Previous XBA series because it wasn't very good at all in terms of timbre though. And the sound stage is sounding like it will be all encompassing and massive.
H3 is the one to get for pure musical nirvana, but it is massive earphone and I can see some people having fit and comfort issues. The H1 is really a great buy as well because it looks to be much more comfortable and small, better for portability, if in doubt get both and use the H1 as your ultra portable and the H3 as semi-portable
I might do that hehe.