Anyone knows if the weapons switches will be very fast (reflex-like), instant (CPM/QW) or relatively slow (Q2/VQ3/CQ3/QL) ?

Anyone knows more about the actual ground accel of the game ? Relatively slow (QW, but higher max speed), normal (Q2/VQ3/CQ3/QL) or fast (Q4) or very fast (CPM/RFLX) ?