K\to\pi l \nu form factor with N_f=2+1 dynamical domain wall fermions
  We present the latest results from the UKQCD/RBC collaborations for the K_{l3} form factor with 2+1 flavours of dynamical domain wall quarks. Simulations are performed on 16^3x32x16 and 24^3x64x16 lattices with three values of the light quark mass, allowing for an extrapolation to the chiral limit. After interpolating to zero momentum transfer, we obtain the preliminary result f_+^{K\pi}(0)=0.9680(16), which is in excellent agreement with an earlier N_f=2 result. 
D.J.Antonio, P.A.Boyle, C.Dawson, T.Izubuchi, A.J\"uttner,   C.Sachrajda, S.Sasaki, A.Soni, R.J.Tweedie, J.M.Zanotti