First: we all should calm down and wait for an official statement - it is the 1st April
.
Second: even if they focus on the M7 - why not? As far a I understood, the M8 and M7 uses in principle almost the same software and hardware. So even if they release the M7 earlier, the software, kernel, etc. has to be developed.
Third: The Samsung chips will not be available until August - so why not put the focus on the M7 first? Or will they equip the M7 with the same processor as the M8? As far as I remember, the M7 has a smaller screen and resolution - so the slower samsung will be used.
Release the M7 in June/July, make first experiences, update it, learn, and make a perfect M8 for August.