It DOES look a bit faster...and that's a good thing. On Sept 18 there will be a firmware update for the xp1 that will make the speed exactly the same.
Looks to me that the advantages of the xe1 are:
-smaller and lighter
-better evf viewfinder
-built in flash
Advantages of xp1:
-hybrid vf
-larger lcd
-more substantial body (all metal, not half plastic) and better heft
For me the VF is the most important of these features. In every other respect they are equal, so it isn't too big a deal either way unless OVF is your main love. FWIW, the photos seem to show that the ex1 MAY have a built in diopter (very nice), though I haven't seen that mentioned in any of the write ups.
Both look GREAT to me 🙂