Recent results from NA48/2 on Ke4 and K3π decays, interpretation in terms of ππ scattering lengths

New results from the NA48/2 experiment at the CERN/SPS are presented. Large samples of Ke4 decays have been collected in 2003 and 2004 in the charged (K±→π+π−e±ν) and neutral (K±→π0π0e±ν) modes. Form factors and Branching fraction measurements are reported. The ππ scattering lengths and can be extracted from the charged Ke4 form factor δ and from the K3π cusp in the distribution.